Replaced a doorbell Pro with a doorbell pro 2, new unit keeps going offline after less than 24 hours

I had to replaced a failed Doorbell Pro so got a Doorbell Pro 2. The previous unit worked well and was reliable for over 2 years with no issues. It was always on line. The Doorbell Pro 2 is powered by a RING mains adapter which is supplying 26Vac at the doorbell. It is connected to the Chime Pro network. This arrangement worked very well with the previous Doorbell Pro. The new Doorbell has been appalling with its reliability. It will go offline between 2-30 hours and will not work continually. It reports an error of P1-70 when it goes off line. If I cycle the power adapter off and on it immediately reconnects and reports good voltage and good network connection but will not stay connected for very long. Is it a faulty unit? Why is the "new and improved" Doorbell 2 so much worse than the old unit? Thanks Jacek