A major problem I've found has to do with the scrubber, at least on the lock screen when trying to scrub you miss it constantly and swipe , unlocking your device rather than scrubbing through the track... Sorry but up there at the top where the scrubber is it should not recognize swipe to unlock, everywhere else is good but stop it clear at the top...
Amazing! At least I'm not crazy, I thought it was just me! This is the most annoying issue I have with the music app. I've submitted a bug report on https://developer.apple.com/bug-reporting, let's see if they fix it.