Your laptop starts charging through a USB-C hub.
A few seconds later, charging stops.
Then it starts again.
You may also notice the charging icon repeatedly appearing and disappearing, Windows playing the USB connection sound, the monitor briefly blinking, or other USB devices reconnecting at the same time.
When USB-C charging repeatedly connects and disconnects through a hub, the problem usually comes from somewhere in the charging chain:
Charger → USB-C Cable → Hub → Laptop
The fastest way to solve it is to identify what triggers the first disconnect.
Quick Answer
Start with the simplest possible setup:
Charger → USB-C Hub → LaptopDisconnect every other peripheral from the hub.
If charging still switches on and off, bypass the hub:
Charger → LaptopIf direct charging is stable, focus on the hub's PD connection, cable, available power, or compatibility.
If direct charging also disconnects, troubleshoot the charger, cable, and laptop USB-C port first.
USB Power Delivery is a defined USB-IF standard for negotiating power between compatible devices, power sources, and cables. You can reference the official USB Power Delivery specification for the underlying standard.
First, Find What Starts the Charging Loop
Different triggers usually point you in different directions.
| When Charging Starts Disconnecting | Check First |
|---|---|
| Even with an empty hub | Charger, cable, PD connection |
| After connecting an SSD or phone | Available power |
| During gaming or video editing | Charger wattage |
| When the cable is moved | Cable or connector |
| Only when charging through the hub | Hub charging path |
| Even with direct charging | Charger, cable, laptop port |
Do not replace several components at once. Change one variable and test again.
1. Test the Charger Directly With the Laptop
Remove the hub and connect the same charger and cable directly to your laptop.
Leave it connected for several minutes.
If direct charging is stable
The charger and laptop can at least maintain a stable connection together.
Reconnect the hub without any accessories attached.
If charging immediately begins cycling again, investigate:
- Hub PD input
- Hub-to-laptop connection
- USB-C charging cable
- Charger compatibility
- Available charging power
If direct charging also disconnects
The hub probably is not the first component you should replace.
Try another compatible charger or USB-C cable and inspect the laptop's charging port.
Microsoft also recommends checking whether the charger and cable support the power level required by the PC, whether the correct USB-C port is being used, and whether an external hub or dock is involved when troubleshooting USB-C charging problems. See Microsoft's Fix USB-C problems in Windows.
2. Add Peripherals Back One at a Time
If charging works normally with an empty hub, reconnect your devices gradually.
A useful order is:
Keyboard / Mouse → Ethernet → Monitor → Webcam → External SSD → Phone
If the charging loop begins immediately after one particular device is attached, available power may be part of the problem.
A hub is an active device. Some incoming power is used by the hub itself and by attached USB peripherals, so the wattage shown on the charger is not automatically the same wattage that finally reaches the laptop. LENTION's existing guide on why a 100W USB-C hub may deliver only 85W or 90W explains this charging chain in more detail.
For a lighter office setup with a monitor, keyboard, mouse, card reader, and occasional USB storage, a USB-C hub with 100W Power Delivery and separate USB 3.0 and USB 2.0 ports can make device allocation simpler: low-bandwidth accessories can use the USB 2.0 ports while the USB 3.0 port remains available for faster storage or data devices. The linked configuration also includes 100W PD input, HDMI, and SD/Micro SD readers.
3. Check the Charger's Wattage
Charging may look completely normal while the laptop is idle but become unstable when power demand increases.
This can happen during:
- Video editing
- Gaming
- Rendering
- Livestreaming
- External display use
- Large SSD transfers
Compare three specifications:
Laptop charging requirement → charger output → hub PD capability
For example, using a low-wattage charger with a laptop that normally expects substantially more power leaves less headroom once the hub and other peripherals also need power.
A hub marked “100W PD” also does not mean that every laptop will always receive exactly 100W. The charger, cable, hub electronics, connected devices, and laptop's own charging limit all affect the result.
4. Test Another USB-C Charging Cable
A faulty or unsuitable cable can create a very specific pattern:
Charging → Disconnect → Reconnect → Charging → Disconnect
Test a second USB-C cable that is rated for the charging power you need.
Pay particular attention if charging changes when you move the cable near:
- The wall charger
- The hub's PD input
- The laptop connector
During troubleshooting, remove unnecessary extension cables, magnetic adapters, couplers, or extra converters.
Keep the charging path simple.
Microsoft's USB-C troubleshooting guidance also notes that the charger and cable need to support the power levels required by the computer.
5. Check Whether Only Charging Resets—or Everything Resets
This distinction can save a lot of troubleshooting time.
Only the battery icon changes
If the monitor, SSD, Ethernet, keyboard, and other USB devices remain connected, focus mainly on:
Charger → cable → PD negotiation → laptop charging requirement
Everything disconnects at once
If the monitor blinks, SSD disappears, and USB devices reconnect at the same moment, the problem may involve the entire hub-to-laptop connection.
Check:
- Hub host connector
- Laptop USB-C port
- Cable fit
- Power availability
- System or firmware updates
For workstations with several SSDs, webcams, or other high-speed USB devices, a 6-in-1 USB-C hub with 100W PD and multiple 5Gbps data ports provides three USB 3.0 ports plus a 5Gbps USB-C data port. This type of port layout is more suitable when several data devices need to operate alongside laptop charging—but it still requires a suitable charger and charging cable.
6. Make Sure the Charger Is Connected to the PD Port
Several USB-C ports on a hub may look almost identical but perform different functions.
For example:
PD / PD IN
Used for charging input.
USB-C Data
Used for SSDs, phones, flash drives, and other data devices.
Host
Connects the hub to the laptop.
Do not assume that every USB-C port supports charging, data, and video.
Connecting the charger to a data-only USB-C port can prevent the expected PD connection, while connecting an SSD to a charging-only PD input will normally not provide data transfer.
7. Perform a Full Power Reset
If the hardware appears compatible but charging continues to cycle, reset the complete PD chain.
- Shut down the laptop.
- Disconnect the hub.
- Unplug the charger.
- Remove all peripherals.
- Wait about 30 seconds.
- Reconnect the charger to power.
- Connect it to the hub's PD input.
- Connect the empty hub to the laptop.
- Start the laptop.
- Add peripherals back gradually.
If charging becomes reliable only when the charger, hub, and laptop are connected in one specific sequence, see USB-C Hub Only Charges When Devices Are Connected in a Certain Order. That guide focuses specifically on PD handshake and connection-order problems.
The 5-Minute Test Before Replacing Anything
You can reduce most charging-loop problems to three tests.
Test 1 — Direct Charging
Charger → LaptopIf unstable, test the charger, cable, or laptop.
Test 2 — Empty Hub
Charger → Hub → LaptopIf direct charging works but this does not, investigate the hub charging path.
Test 3 — Add Devices
Add peripherals one at a time.
If the problem begins only after an SSD, webcam, phone, or other device is connected, investigate available power and peripheral load.
The first test that reproduces the charging loop is usually the strongest clue.
Final Verdict
If a USB-C charger connects and disconnects every few seconds through a hub, don't start by randomly replacing accessories.
Follow the symptom.
Empty hub already disconnects:
Check the charger, cable, PD input, and hub charging path.
An SSD or phone starts the problem:
Check the power budget.
Heavy laptop use starts the problem:
Check charger wattage.
Moving the cable causes it:
Test another cable and inspect the connectors.
Direct charging also disconnects:
Troubleshoot the charger, cable, or laptop first.
The simplest rule is:
Find what starts the charging loop, then troubleshoot only that part of the charging chain.
FAQ
Why does my USB-C charger keep connecting and disconnecting through a hub?
The charger, cable, hub, and laptop may not be maintaining a stable USB Power Delivery connection. Test direct charging first, then test the empty hub before reconnecting peripherals.
Can an underpowered USB-C charger cause repeated disconnects?
Yes. The charger and cable should meet the laptop's power requirements. Using a hub and additional peripherals can further reduce available power headroom. Microsoft includes charger power, cable capability, port selection, and external docks among its USB-C troubleshooting considerations.
Can an external SSD make charging unstable?
If charging is stable until the SSD is connected, the additional device load can be an important clue. Remove the SSD and reconnect other devices one at a time.
Why does my monitor blink when the charger reconnects?
If the complete hub connection resets rather than only the charging state changing, video and USB devices may briefly reinitialize as well.
Does a 100W USB-C hub always give the laptop 100W?
No. Hub electronics, peripherals, the charger, cable, and laptop charging limit can all affect the final power reaching the computer.
