I have a Maytag gas freestanding range mgr5729adw. I turned on the broiler and it started up fine, then I heard a loud pop and the display went dark. Several minutes later the display turned on again reading F1. I then unplugged it for 4 minutes and plugged it back in. It flashed F1, then OFF, then F1 again and steadily showed F1. What could be the problem? Thanks.