Hi! Welcome! As above, Monzo are aware and are working on it. I’m sure they’ll share the fix with us when they have one. For now it’s just going to be a case of trial and error with the various troubleshooting tips outlined in the other thread linked to above I’m afraid. 
I hope a fix is near. It’s been going on for far too long now, and if anything seems to be getting worse, not better.