Wireguard VPN stops and needs regular rebooting

Very likely, one side or the other is experiencing a change of IP addresses. If you're connecting to a commercial VPN, this wouldn't happen on their side, but could be your side if/when you DHCP/PPPoE based IP address changes. If you're connecting to a peer that is using a dynamic IP (again, DHCP or PPPoE), that side could also be implicated.

If it is as I described above, no, not a bug.

There are a few ways of handling this situation, but one of the easy ones is Watchcat. If the tunnel stops working, simply performing an ifdown/ifup of the WG interface should usually fix that problem.

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