I don't have repeat on, shuffle is set to all, I have nothing in the que. The first time I noticed, I searched for a song in library. The next day it would only shuffle songs in either the same album or band folder. The only thing that seems to work is to go back library, I usually choose album, pick the first album and song, and skip track to see if it shuffles. It works, but maybe a day later, it will get stuck on the same folder or album that it last played.
Also when it first started happening, I would do the above steps, but then it would go back to the first band that I searched for when I noticed it happening.
Another thing that I forgot to mention in my op, and this maybe the phone I use, is when I plug a jack in, it wont start Poweramp like it used to. I have it set to "resume on wired headset". Sometimes it will come on for a second and cut out. Maybe do this a couple times, but only thing that works is to open my phone go to the Poweramp widget and press play.