Missing notifications

Ok, I'm fed up with this and I'm very close to the point of returning this doorbell and getting a refund.I was sat working at my desk when my phone made an "email received" beep. It was a message from a courier saying they had attempted delivery and left a "no answer card".**There was no Ring notification on the phone.**When I opened the ring app I could see the Missed Ring event and could watch it back and see the guy press the bell and wave at it.Things I've tried to make this unit work properly:- Clearing the app data and reinstalling the android app ( twice )- De-synchronizing my 2.4ghz and 5ghz wifi networks- Buying a wifi booster (although the signal was never weak enough to stop OTHER notifications like email and twitter coming through)I've just turned off motion detection because I read somewhere that motion events and ring events can interfere with each other. (This smacks of faulty event processing to me)So far the only reliable way to get this device to work is to press the doorbell myself.I'm very IT literate person, I'm a 30 veteran of coding and computers in general. It just seems to me that these devices dont work properly in the real world.