[Q] THOR:Status bar and optional bar are disappear. topic

HI, here is my situation: my status bar and optiona bar are disappear for no reason, they just go black and no response.
I have tried using Amazon recovery which is helpless, then i created a rom slot and flash the thor-gapps-rom (update 2). I did backup/restore and yes, i got status bar but it can not hide.Is there anyone can help me out?