Ring doorbell pro not connecting to wifi or chime and has power

ok so i have had a ring doorbell pro since 2018 and then in july the whole unit went dead. I got a replacement pro and it worked for a week then would not connect to wifi. No wifi displaed in list when attempting to manually enter it. Ring Cust service they tried and nothing. Sent out a new unit and it also worked great for a week and then wouldnt record or show video. The sytem says good transformer and good RSSI. The power works becasue the mechanical chime works when doorbell is pressed. Then Ring sent out another cam- worked another week and same issues. I do not understand how had same wifi and same camera since 2018. Please help