Troubleshooting · Plain-English answer
Frequent drops usually come from the network underneath the VPN: weak Wi-Fi, switching between Wi-Fi and mobile data, or a router that times out idle connections. On phones, aggressive battery optimisation often kills the VPN app in the background. A kill switch keeps traffic protected during each drop.
A VPN can only be as stable as the connection underneath it, so start there. If your Wi-Fi signal is marginal, the VPN disconnects every time the wireless link stutters, and it gets blamed for a radio problem. Moving closer to the router or using a cable settles the question quickly.
On phones, the usual culprit is the operating system itself. Battery optimisation kills background apps to save power, and VPN apps are frequent victims. Exempting the app from battery optimisation in system settings stops most mysterious mobile drops.
Use WireGuard if the app offers protocol choices, since it survives network changes and sleep far better than older protocols and reconnects in moments when a drop does happen. Keep the app updated, and if drops cluster on one server, switch, because individual servers do get restarted.
Finally, turn the kill switch on. It cannot prevent disconnections, but it guarantees nothing leaks in the seconds before the tunnel comes back, which turns drops from a privacy problem into a minor annoyance.
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