Ring 2 Door Bell - Very Unreliable

Good afternoon, I have a Ring 2 door bell which is proving to be very unreliable whenever i want to check the camera. It does not connect for around 70% of the time i try. I get the 'loading live' view for a while before the error 'could not open live view' message. My other wifi devices work fine around the home and my broadband connection tests have gone back strong and good too. I've also tried the connectivity test within the app and it always come back with success. The wifi test within the app is always positive also. I'm at a lost as to what do next other than returning the device as faulty and not fit for purpose. Any ideas? Many thanks, Rob.