M4a files stutter on N73

Hello.
I have a N73 phone, RM-133, recently upgraded to firmware 4.0726.2.0.1. A while ago I decided to convert my music files to M4A (higher quality 64kbps) when transferring them to my phone's memory card.
Now I have encountered a very annoying problem: whenever I play my music files while using other applications (such as internet browser), the sound stutters and sometimes it even stops playing. I never had this problem when my music files were in MP3 format.
Has anyone here encountered this problem?
Do you know what I should do to fiz this?
Should I try and convert my music files to AAC or simply leave them as MP3?
The main reason why I decided to use M4A format was to save space in my memory card, but that is pointless if I cannot use the music player along with another application.
Thanks in advance!
N73
5300

depends how many programs are open, plus m4a take up more effort to run due to quality so it could be that or it could be the internet page ur viewing. use mp3, much better + easier

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