My issues have been not getting messages (both iOS and Android users, MMS and SMS, on wifi/not on wifi), missing notifications (on phone, on watch, on Mac) and not getting incoming phone calls (doesn't ring and goes to voicemail for the caller). They all seem to be related as they started at the same time and at times when one gets fixed, the other restarts. So far....the past few days have all been good. I'm on an iPhone 12 Pro, 2 series 6 watches, iPad Pro, M1 MBA