Suspend works, but after waking it back up, there is no internet connection and I cannot reconnect, so I have to restart (or just re-login? I forgot) to get internet again.

Executing 'systemctl restart networking' or 'systemctl restart NetworkManager' should be enough.

Suspending can be useful to let the computer cool down in order to prevent emergency shutdowns from overheating.

Or just to save energy.

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