Doorbell Pro constantly turning off

Hi,My Ring Doorbell Pro is hardwired using the supplied Ring adaptor that came with it, plugged directly into a power socket. We have only been in this newly built house not even 2 years and the doorbell is starting to turn off.Using the app it says that it is only getting 8V. I unplug the adaptor plug it back in and it’s all good. However after approximately 2 - 3 uses it goes back to turning off again.Anyone else having these issues or know how to fix it?