I have a GE Model number PHS920SF1SS that when you go thru start procedures for the oven you push the appropriate button(bake, convection bake etc) then press in the desired temp then the start button it comes on for approximately 5 seconds with PRE in the display then just shuts off and display goes back blank like someone hit the cancel button. The cooktop does pretty much the same thing I have turned off breaker and sometimes it will come up to heat but will eventually shut back down and repeats the 5 second shut down. I dont want to just start throwing parts and $s at it any suggestions?