c600 sound problems

[Guest bleep]

im on my third c600 now after only 2weeks.

1st one keys stopped working

2nd wouldnt accept any simcard (faulty unit)

now my third works great nice and quick (much quicker than the others and smoother) but im having a few little problem with sounds.

I have my mp3 ringtones / wav alerts on my memory card but when im using programs like mame3d or picodriver or even bubble popper....

and i get a phone call the phone freezes and the sound plays really slow and broken up (like a pc would do when it has virtuall no memory)

if i exit out of the programs it stays like this until i kill all the apps and its fine then.

Its probably got something to do with all the memory being used but should it freeze and slow the music etc down ???

any help would be greatful or any advice on tweeks etc ;)