Nokia Asha 501 keeps going white and resetting ONLY while playing music.love this phone for music…help?!

I have a nokia asha, it's FANTASTIC for music, battery lasts long, speakers are great, super happy with it, i've had it for a little over a year… In the last few days if i play music for too long, or keep manually selecting songs, the music stops, the phone goes white, and in like 30 seconds it's back on no problem, but i have to start the music over… It's ALMOST like the phone restarts, but not fully, like it doesn't shut down or turn back on, it just kinda comes back up… Refreshes almost… Tried resetting the phone, reformatted the sd card, cleaned about half of the music off, put a piece of paper in the back of the phone to secure the battery, but i'm not sure the battery is rly the problem, it only happens with music. The whole phone just fades to white and stops the music… Very strange but it seems like if i don't mess with it and just let it play on it's own, it's fine. I don't think the screen is disconnecting, becuz the audio stops as well, not just the screen… Any ideas?

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