Since latest Avast release yesterday, v11.2.2261, I get " There is a problem connecting securely to this website. " when I try to visit https://www.facebook.com .
If I ‘sleep’ Avast for 10 minutes, the problem disappears.
Yes - thanks for the workaround, but I prefer not to disable a feature permanently - and hope my post will be reviewed as a ‘bug report’ by Avast developers.