GE Profile Wall Oven shuts off intermittently , also will lock itself too during cool down

I have a double wall oven, GE Profile, convection top oven. When pre-heating it will shut itself off sometimes. Also while cooling down it will go into a locked mode. No error codes appear. Just had repairman here, he was a kid, and just said it needs a new board and that's basically $600 all in. Just wondering what you all know about this model and if you think it's the board or something else? Thanks

via GE Profile Wall Oven shuts off intermittently , also will lock itself too during cool down
by Jenniferalovett