Doorbell does not let to connect to live view every week, but shows online

1 month ago I installed doorbell 2020 edition and every single week it goes offline after working 3-5days. I have to hard reset doorbell to make it work again for 3-5 days and then it goes down again.Ring support on this is terrible, every time the same thing:- Testing wifi - all good. Test on Ring and Ring Rapid app - same behavior. Testing with wifi off on the phone - same behaviour.- Doorbell shows online, but no live view is available. I was asked to reset router - no help. But if I reset doorbell all works good for next few days.- Because after the reset doorbell works OK, I am told doorbell works OK and it will not fail.- 3 -5 days later doorbell stops working.- I call support and it is the same cycle of support as they "Do not see anything wrong".I already spend 3-4 hours on support with Doorbell and so far no help. I have Ring floodcam at the same location that works without problems.Can anyone help me to figure out why my doorbell stops working every week?