Ge oven jtp18 broiler mode

Has any solutions been found for oven going into broiler mode without humans anywhere near it. Did it twice today and finally told my wife to kill breaker so it won't burn down house. Like other post, keypad died and only clear worked. It asked to have start pressed but start didn't work. After turning power back on, seems to work fine, all buttons and functions. Must be a relay??? Key pad or board more likely to be problem? Noticed on repaire clinic, boards have been changed as to wiring. How hard to replace with this new type of board? Thanks, Bill