After successful set up my UK Doorbell Pro goes back to set up mode - Please help!

Having had a Doorbell pro for 2 years it stopped working and I purchased a new one. I installed it with the new power converter and successfully set it up connecting to my WiFi. One minuite later it moved back into set up mode (white spinning light). I figured it was trying to update or something so left it overnight. I just reset it up having had to do a hard reset to get it moving again and now having told me it was successful it has gone back offline with white spinning light. Please help!