Turning deep guard off seems to solve messenger signing out repeatedly,.There appears to be a problem with deep guard
Does it help if you under the settings for Deepguard disable "Use advanced process monitoring"?
Or do you still get signed out?
That currently doesn't work for me. In my system, disabling Deep guard completely doesn't solve the problem. I can only stop messenger disconnections if I disable song displaying in messenger. Not sure which part of F-secure is problematic as disabling each part of the antivirus or firewall, or even Online Safety, doesn't fix the problem.