Electric Double Wall Oven Amana

I have a Amana electric convection Wall Oven model ACO27DEW1(mfg# 1132334).At lower oven control :Touch bake or broil and I need to hold any one of the setting buttons on the control center numerous times or for long periods of times for the oven to finally respond. It will start at [COLOR=Red]preheat temp of 170 degrees for about 15-30[/COLOR] [COLOR=Red]seconds then will shut off by itself[/COLOR]. Do you have any Ideas? How to fix it?

Thanks,

The circuit board with buttons is no longer available and the ERC is a special order part which can end up as no longer available too. Looks like it is time for a new oven.

Gene.