One day it worked perfectly, other day, it stopped working. 

My doorbell. When someone rings it, I hear 3 notification sounds on my phone, then it stops. No popup, no way I can even answer the doorbell when I am not in home, or even in home. If is not working over Wifi or using 4/5G.

Whats going on. All notifications are set how it should, triple checked that. Phone used is a S25 ultra. 

Please advice.