iPod Volume after iOS4.0

I noticed the same thing, my volume level is really low compared to what it used to be

 

Fluctuating Volume with Too Many Apps Running in Multitask

I noticed yesterday that my volume kept fluctuating up and down and the primary cause turned out to be that there were too many apps running in the background. I've seen this on 3.1.3 when I had a game open while listening to my iPod and I locked the device - it made my music skip. Could be that am on a 3GS but that's some funky stuff.