ADT Door Window battery draining fast

I’ve had my SmartThings / ADT system since Lowe’s Iris went away and have been very happy. I have one ADT door sensor that has recently started eating batteries. Has been fine for over a year with frequent use but now I have to change it every couple weeks. It is probably 20’ from the hub and is in the same sunroom with 9 other identical sensors that are fine. I have probably 10 more around the house and all of them including frequently used doors are fine. Any suggestions are greatly appreciated! Thank you.