Motion Detection not working

Hi Ring, We have recently purchased a Ring 2nd Gen doorbell, it arrived yesterday. I set it up and initially it seemed to be working fine, the button and the motion detection with notifications to my phone seemed to be fine. We left it on charge for a number of hours and it reached 100% at this point pretty much any movement of the device would trigger a motion detection notification. We then moved the device, as no longer on charge and since then it has not been picking up motion effectively or consistently. There have been a handful of times when we have received a notification of motion, in at least one occasion this was seriously delayed. I have checked all of the settings I can see. The zones are all on, the Motion Frequency is set to frequent and no change. At present the device is in our lounge, I dont want to install it if it is faulty. Please advise... Kind regards Vanessa