This has been happening to me for a few months too. I’ve since updated Android with no change. A restart always solves the issue temporarily, but I don’t like restarting too often because I sometimes lose my internet, whatsapp and Drive shortcuts when I do that. The suggested solution for the latter was a factory reset - no thanks.
Fairphone admitted a fault 2 years ago, and claimed to release a fix, but it seems it didn’t fix all cases. An update from our CEO: Reported software issues and our next steps - Fairphone