Well, um, I said it already but I’ll say it again … I really think you should be contacting Purism support. Something isn’t right. “No one” else is having a similar problem. It can be hard to understand what you are observing without actually seeing it. Someone might want remote access into the phone in order to investigate (and that should be Purism support, not some random on the internet 1).
However it might also be suggested that you need to reflash the phone in order to make a clean start and potentially eliminate config or software problems. I don’t know whether you are up for that.
1 We get scam calls all the time telling us that our Windows computer has been compromised and is responsible for criminal activity but that the helpful man on the phone will be able to fix the problem with remote access. Not that we personally have a Windows computer …