So as of about a month or two ago, I began having this issue. I have used Poweramp for a year or so, and I love it! This is getting super annoying though lol, hoping there may be a solution or it may just be a bug!
Basically, when I hop in the car my bluetooth used to connect and just start playing where it left off, no big deal, just how I like it! Suddenly, when I hop in and it connects, a couple things can happen. Sometimes it plays, then pauses, then resumes. Sometimes it plays, then skips a track forward. Sometimes after the skip it\ll pause, sometimes resume. It doesn't