Hello. I'm having some problems with homepage apearance on my Samsung Galuxy J5 phone.

No matter in which condition I lock my phone, henever I unlock it, the 1st honepage appears automatically.

For example if I'm using MX player and I pause it and leave the phone, after a while when I unlock the phone, in stead of appearing MX player, homepage appears itself.

I tried restarting my phone, and after I restart it, the problem solves for a while, but it appears again. I am not getting any permanent solution.

what should I do?