Ring 2 doorbell looses live view and enters setup mode automaticly

I use the doorbell a few Days but My ring doorbell suddenly loose live view and when i look at the Bell the wite leds are tuning so it's in setup modus. If i check the app it shows it's online and if i check health it's connected. If i choose change wifi, and take all the steps it reconnects with the network and works a few hours or Days. Really frustrating. There is 1 wall between the Bell and the router. The speedtest give around 50 download and 15 upload Anybody a solution??