I've been having problems with my wf-1000xm4's.   The left ear bud battery runs down considerably faster than the right. 
I'm aware one does more work than the other but from a full charge I'm getting maybe 2 hours before the low battery warning, left bud 20%, right bud 84%.

I've cleaned all the connections although it's charging ok, just running out fast.  Anyone know of a fix?