Internet & Network / Internet Connection
How to Fix Internet That Disconnects When a Windows PC Sleeps
Quick answer
If the connection dies only after Sleep, Hibernate, or closing the lid, open Device Manager → your Wi-Fi or Ethernet adapter → Power Management and uncheck "Allow the computer to turn off this device to save power." That is the first fix. [Wi-Fi that keeps disconnecting](/guides/wifi-keeps-disconnecting-windows-11) while you are actively using the PC is a different pattern (signal, radio).
Quick diagnosis
If several of these match what you see, you are in the right guide.
- Internet works, you close the lid or sleep, then it is gone on wake
- You must toggle Wi-Fi or unplug Ethernet to get online again
- The adapter disappears until a reboot
- Only happens after sleep, not during active use
Possible causes
- Windows is allowed to turn the adapter off to save power
- A wireless driver that does not resume cleanly
- Fast Startup / hybrid sleep leaving the NIC in a bad state
- A USB Ethernet or dock that loses power in sleep
- The router dropping the lease while the PC is asleep (less common; usually recovers on wake)
What you need
- Device Manager
- Settings → Power
What this problem usually means
Sleep cuts power to parts Windows thinks it can spare. Many Wi-Fi and USB-Ethernet devices come back confused. The internet path was fine before sleep; do not start with a full network reset.
Before you start
- Note Sleep versus Shut down. Fast Startup shutdowns can look like sleep problems.
- If the adapter is missing entirely after wake, also read Wi-Fi adapter missing.
Quick fixes
1. Adapter power saving off
- Device Manager → Network adapters → the device you actually use.
- Properties → Power Management → uncheck Allow the computer to turn off this device to save power (if the tab exists).
- On a USB Ethernet or dock, also check the USB Root Hub Power Management the same way (careful: do not disable hubs you need; only uncheck the "turn off to save power" box).
2. Wake test
Sleep from Start, wait a minute, wake. If the network returns without toggling Wi-Fi, you are done. If it still dies, update the adapter from Windows Update optional updates or the PC maker, not a booster.
Step-by-step troubleshooting
PCI Express power saving (laptops)
Power plan → Change plan settings → Change advanced power settings → PCI Express → Link State Power Management → Off, as a test. This can help NICs that sit on a power-managed bus. It uses a little more battery. Put it back if it does nothing.
Dock and USB Ethernet
Docks often lose the NIC in sleep. Test the same adapter in a port on the PC. If the onboard port survives sleep and the dock does not, the dock firmware or cable is the limit. Windows settings will not fix a cheap dock.
Fast Startup
If the problem is after Shut down, not Sleep, turn off Fast Startup as in the won't shut down guide. Hybrid shutdown leaves devices half-asleep.
When does the connection die?
Choose an answer. The next question appears below, no account or download required.
Power Management on the adapter first. Then vendor driver. Skip password/Forget-network steps unless wake leaves you disconnected from the SSID.
This article is the wrong one. Use Wi-Fi disconnecting or Ethernet not working.
Treat as a missing adapter after resume. Power saving plus adapter missing.
How to know the problem is fixed
After two or three sleep/wake cycles, a website loads without toggling Wi-Fi or reseating the cable.
If the problem continues
A USB Wi-Fi adapter that resumes when the internal one does not is a hardware or firmware limit on the internal card. Network reset is a weak match for a sleep-only bug.
When this may be hardware failure
A dock or USB NIC that never resumes on any PC is that accessory. An internal card that vanishes after every sleep, with power saving off and a current vendor driver, may be failing, confirm with another adapter.
Common mistakes to avoid
- Forgetting the Wi-Fi network because sleep confused the NIC.
- Disabling sleep entirely as the first "fix" (it works; it is not a diagnosis).
- Installing a Wi-Fi booster app.
Frequently asked questions
Will this drain the battery?
Leaving the NIC powered uses a little more energy in sleep. For most people it is the right trade. If battery life collapses, put the checkbox back and update the driver instead.
Does Hibernate count?
Yes. Hibernate writes memory to disk and cuts more power. NICs that fail after Sleep often fail after Hibernate too. Test both if you use both.
Written by Practical PC editorial team. We write practical Windows and PC troubleshooting guides for home users, students, and office workers. Guides are researched from official documentation and widely observed support patterns, then reviewed for safety and plain language. We do not invent lab tests, certifications, or first-hand repair experience we do not have.