Slowdown while playing music, anyone else?
 

I've noticed that some songs slow down or even speed up while playing. I'm running over bluetooth headphones, I've not tried this with normal corded ones yet. Is this a product of BT or just the phone trying to catch up?

I've never heard a mp3 actually changing tempo (as opposed to maybe it skipping, buffering, etc.).

And external device such as headphones (wired or not) will not modify an mp3 file or change a tempo in your media player.

Give us more info. For example what media player are you using, etc.

late,
Coz