Share your experience!
Hi,
That sounds strange, no pun intended. 
Can it happen during continous playback? If so, how long would you say it takes before it happens?
Also, what file format are your songs in?
I have tried to replicate this but haven't been able to do so. I suggest that you perform a software repair via PC Companion.
In PC Companion you press start on "Support Zone" > Start on "Update the phone/tablet software" > "Repair phone/tablet" (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.
Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.
The software repair will remove all data stored in the phone so don't forget to make a backup in PC Companion before you try the software repair. You can do a backup using the Backup & Restore option in PC Companion.