Cellphone hanging. How can we avoid it?

I'm just curious. Because 3 months ago, I just bought a new cellphone for myself. But when example I am listening to music while viewing pictures, when i click BACK, the screen will turn all white then I have to restart it.

It did not happen only to that phone. It happened alot with my other/past cellphones.

Is there anyway I can avoid it? Any tips/suggestions?
 
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