Oven will completely shut off (all power) after around 20 minutes of usage, whether on Bake or Broil. It will completely off (all power, even clock) for about 60 -90 after which it will come back on again.
Not sure if it is microcomputer or control panel membrane. Any thoughts. I am told the micro computer is not longer available from Whirlpool and no substitutes. I was shocked to hear that…not that old.
Most likely the problem is a bad control board (microcomputer) which comes together with a suppressor board and installation instructions for this board. I do not know who told you this part is no longer available. It is available and you can buy it from Appliance Parts Pros.