SAMSUNG-> A-715 w BLACK WHITE SCREEN COLOUR GOES OFF ?

Richard Murray

  SO, WHEN THE A-715 FIRST BOOTS UP IT RUNS FULL COLOUR for 7-8 MINUTES then TURNS BLACK N WHITE ' EVERYTHING FROM APPS TO E MAIL AND PHOTOES N VIDS, SETTINGS TOO...SO  WHATS UP WITH MY PHONE OR THAT I COULD TRY OR MAYBE A FACTORY RESET. 

just the last 3 days when I turn off my sleep app in the morning, The A-715w os is in colour IN the moment, then after 5 minutes it goes black & white!
sync is on or off makes no difference, I've tried every setting I could try / no difference
I reset everything except the factory reset, I can't find any backups at the moment, also the last security update was Dec 1,2021 Patch and it said I can't go back once installed, I'm sure that if I factory reset it, it should automatically search for updates once online ...correct me if I'm wrong pls....I'm hoping it will correct itself from the problem.
? ANY HELP AT ALL WOULD BE GREAT THANKS EVERYONE