I've had my 5D3 since the summer, and until today I've had no issues. During playing around with my macro and flash, the top wheel stopped functioning. I could no longer change any settings, nor could I navigate through any menus. It began functioning after I pulled the battery grip out for a second time, and appears to be functioning normally. Anyone else experience a similar error? Or perhaps it's just one of those strange goofs that seems to happen to electronics occasionally. Either way I'll probably just take it to Canon for a checkup since it is close to my house, and I'd rather have it addressed while in warranty.