2019 MS - Keyfob suddenly acting wonky

Hi all - to satisfy the Bot... 2019 MSLR (Raven) / eastern US.

This fob has worked fine for over two years and a couple of battery changes. Latest new battery was about a month ago and car isn't giving a low battery alert right now, but I'm willing to try swapping it out...

"Symptoms"
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If I walk up to the car, the handles don't immediately Present, I have to double-press the fob and then it unlocks and the handles present.

If I'm sitting in the car for a few minutes without driving, it will seem to forget the fob is there, and ask me to activate the FOB before driving. Double-press turns car on again.

If I'm standing next to the car talking to someone, it will lock and Sentry will go nuts recording me, like as though I don't have the fob right there.

Fob otherwise seems to work normally, with normal range for locking / unlocking / trunk / etc..

Any ideas?