I am using this DoorBell:
https://shop.yooseecamera.com/doorbellcam/yoosee-smart-doorbell-intercom-rfid-function-hd-cam
Sometimes it goes offline and turns off when opening the gate from the app. Not all times but raughly from 5 times once sure. And i have to repower it (unplug 12V and back)...