I've come across something yesterday on the road which hasn't happened before yet, and surprised me a bit.
Basically, I listen to music on my S2 while riding my motorbike, and yesterday I noticed that at higher speeds the music gets slower and even "blurry", sounded similar to the old (showing my age now) tape disks when the tape was dirty or stuck or lose. I keep my S2 in my right side pocket inside my jacket, and noticed when while this problem appears I press lightly against the phone it returns to normal again. Sometimes it stays normal for a little while, sometimes it reverts back to this 'broken' sound as soon as I stop pressing it lightly.
Later I shut the phone down and powered it back up, hoping that may sort it out, but the problem still persists. It appears it's not every time it happens. Earlier this morning at higher speeds nothing happened, later on it returned however.
I appreciate that this problem is likely difficult to reproduce, and I haven't heard of anyone else yet with a similar problem. If anyone does have an idea or knows what it could be, I'd appreciate your input.