A tunnel that drops once a week is bad luck. When your VPN keeps disconnecting every few minutes, there is a pattern underneath it, and the pattern is the diagnosis. Before changing settings, note two things: how long it stays up, and whether it drops while you are using it or only after idle time. Those two answers point straight at the cause.
Read the pattern first
| When it drops | Likely cause | Fix |
|---|---|---|
| After a few minutes idle | Power saving suspending the adapter | Fix 1 |
| Every few minutes under load | Protocol or MTU mismatch | Fixes 2–3 |
| Only on Wi-Fi, never on cable | Weak signal or roaming between bands | Fix 4 |
| At the same time each day | Router reboot or ISP session reset | Fix 5 |
| Right after waking the laptop | Reconnect logic, not a fault | Fix 6 |
| Only on one network | That network blocks VPN traffic | Fix 7 |
Fix 1: stop the system suspending the adapter
Windows is allowed to power down network adapters to save energy, and a suspended adapter takes the tunnel with it. In Device Manager, open your network adapter, go to Power Management and clear the option that lets the computer turn the device off. On a laptop, check the power plan too — the aggressive profile does this more often.
Fixes 2 and 3: protocol and packet size
Switch the protocol in your app’s settings. WireGuard and the provider-branded builds on top of it reconnect far more gracefully than older options, and on an unstable line that alone can end the problem. If drops happen specifically during large transfers, the packet size is the next suspect. Lowering the MTU a little in the app’s advanced settings stops fragmentation that some routes handle badly.
Fix 4: separate the VPN from the Wi-Fi
Test once with an ethernet cable. If the tunnel holds for an hour on cable and drops every ten minutes on Wi-Fi, you are not debugging a VPN — you are debugging a wireless link. Dual-band routers that move a device between 2.4 and 5 GHz mid-session are a frequent cause; pinning the device to one band usually settles it.
Fixes 5 to 7: the network itself
- Check whether the router reboots on a schedule, or whether your provider resets the session daily. A drop at the same hour every day is rarely a coincidence.
- Enable the app’s auto-reconnect and kill switch so a brief drop does not silently expose traffic.
- On office, hotel and guest networks, try the provider’s obfuscated or TCP mode — those networks often throttle or block standard VPN traffic.
- Change server before changing anything else; a single overloaded endpoint can look exactly like a local fault.
When a VPN keeps disconnecting only in the browser
If the connection is steady everywhere except Chrome, you are almost certainly using a browser extension rather than the application. The extension is being reset by the browser, not by the network. That is a different problem with different fixes. Our comparison of VPN extension vs VPN app explains which one you are actually running, and VPN not working on Chrome covers the browser-side causes.
Does a kill switch stop the disconnections?
No, and that confusion is common. A kill switch does not keep the tunnel alive; it blocks traffic while the tunnel is down, so nothing leaks during the gap. It protects you from the symptom rather than removing the cause — keep it on, but keep looking.
Could the free plan be the reason?
Sometimes. Free tiers crowd many users onto a few servers and some disconnect sessions deliberately once a data allowance is reached. If drops arrive after roughly the same amount of traffic each time rather than the same amount of time, that is the signal. Our guide to slow VPN fixes covers the related capacity symptoms.
Note the timing before you touch anything and most of this resolves quickly. When a VPN keeps disconnecting the answer is usually power management, an old protocol or a wireless link that was never stable — and each of those is one setting away from being ruled out.