Tracks don't play, stays at 0:00 although it is set on play [Premium]

[diekaputten1]

I am mainly using my phone in offline mode to hear songs.

I downloaded everything i want to hear and it has the green arrow, so it should be possible to play it.

About half the tracks are playin as they should, other tracks are just staying at 0:00, although the play button was pressed, it does not change anything. I can't even go to a different part of the track, it always stays at 0:00.

Other tracks play normally until the last second of the track. They'll stop then and won't proceed anymore (they still are set on play). I have to go to the next track manually.

That's really annoying and i can't seem to be able to find a solution.