We have an older GE oven with electric starter and gas. Model# JGRSI5GEL3BG, serial# VA360674Q. It has worked fine over the years, but lately when it is in the bake mode after a few minutes it will just shut off. It will start again if we go to bake sometimes. It is getting really annoying, can you help. I am thinking it is in the button area, since the electric starter works and so does the gas flame going on.