Ring video doorbell pro offline

Hi community,maybe you can help me to figure out why my video doorbell pro goes offline from time to time. Currently i can't tell you why and when. Would like to get some ideas what the issue could be.My RSSI is around 52. The doorbell is directly connected to my repeater which is 3-4 meters behind the wall where the doorbell is mounted. It has a static ip address so that i can use it for a status check (ping it every 2 minuts to check when the status switches). The doorbell is physically connected to the old bell wires. Sometimes the doorbell comes online again after a few minutes. If not i have to disconnect it from the old bell wires and reconnect it.Any ideas what the issue could be are appreciated.Thanks,Jochen