S7 Edge Nougat Optimise problem

A

AC Question

So , after the nougat update , the design is awesome in my opinion , performance wise slower a bit . I mean sometimes it lags etc , didn't have that problem before . My biggest problem so far is , there is this new feature ' Optimise ' , closes apps etc . Sometimes it restarts my phone , I think it closes the operating sistem or something like that .. Does anyone have this issue or know how to fix it ?