My Lichess connection is no longer active

Try to manually reconnect to Lichess.
Disconnect and restart the app if necessary. Log on to the Lichess server again.
Check if you can log into the Lichess website. Could your account have been blocked by the server?
If your mobile device was in sleep mode (yellow icon), reconnect manually via the server icon.
If manual reconnection does not work, exit the app and restart it. Log on to the server again.
Check on the Lichess website if you are shown as online.