Encountering the same problem right now, in mu case it the fb, messenger that seems to cause the issue so i uninstall those two and new app ls that i have install, and also everytime i install a new app zen ui crashes, it really has something to do with operating system like the reply above, now i am replying from my phone barely fix the issue, for the record its the fourth time muliple restart. Still under observation. Hope it will be fixed soon