Dramatic reduction in battery performance of Ring Video Doorbell 4

I've found the battery in the Ring Video Doorbell 4 running down much faster recently, but I'm at a loss on why this is happening considering there has been no change to the settings or environment recently.I have a spare battery pack for the doorbell and I switched the battery on the 22nd December after getting the notification that battery was at 20%. This has been running since 17th November so I was reasonably happy with the performance. Then on the 3rd January 2022, I got a notification that battery was low (it was at 7%) and needed to be recharged so I swapped the battery pack again to a fully charged one. Now on the 5th January, the battery level is already down to 59%.I have not changed any of the power settings (I've had snapshots off and motion frequency set to minimal since November), RSSI is good at -42 and the weather has actually been warmer than November/ early December due to the recent unseasonal weather. I'm at a loss now on what else I try to diagnose the root cause of this battery drain.