Troubles with changing game modes.

I play Minecraft on Xbox 1S and have done so for 4 months. Up until about 2 weeks ago I was able to change back and forth from creative to survival game modes with no problems. Now when I try to switch my game mode, the game acts as if I've done nothing. I don't get the message stating game mode has been updated or anything like that. and once I try switching game modes I am no longer able to open anything, ie chests, furnaces, etc.