Suddenly apps close on Android Lollipop Version 5.1

I am having this issue since first day i bought this phone(Q mobile Noir Z12), app like battery doctor, 360 security closes from back end after 5 minutes...this is really annoying...this doesn't happen with apps like Facebook...even the phone had 3 GB RAM. I don't know if this issue is with my phone only or with Android Lollipop Version 5.1.Require help,Sorry for my bad english.

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