Track Skip Doesn't Always Work

The Track Up and Down buttons on my radio don't always advance a track on my USB drive.

Pressing either button often does not change the track. Works sometimes, but usually not.
If I hold either button down, I always get the expected fast forward or reverse, but no skip ahead or back to another song.

The Up and Down buttons on the steering wheel don't change the track either.

2012 Prius v three

Any thoughts on this?
Anybody else have the same issue?