Arrival sensor battery life... Very erratic readings

My ST arrival sensor on my wife’s keyset displays very erratic battery reading levels. For example over the course of today alone it has gone from 50% in the middle of last night to 12% earlier today.

I put a new battery in in a couple of weeks ago so the battery should be good.

Anyone else seeing this? Is there a known problem with these arrival sensors? My sensor is showing 37% even though I also changed battery at the same time

Yes. I have two of them. One I purchased and the other SmartThings sent me as a replacement. Both have the same battery issue . It annoying and they should refund our money.

Is there an alternative unit from another manufacturer which can be used instead?