Microwave is turning itself bad? I have a Panasonic Inverter Microwave, NN-S953WF model. It is turning itself past...

I have a Panasonic Inverter Microwave, NN-S953WF model.
It is turning itself past its sell-by date after running for approximately 23 to 26 seconds. Yes, I did time it, tried it four times and this is what continued to start.
Anyone have any planning of what the problem might be, or is it time for a new microwave?
Thanks!!
Salamander Heater Problem.?
Answers:    Could be several things. May be a timer anomaly. Could be a problem in the circuit board. If it's a stand alone component (not built in) then it might be clever just to bite the bullet and get hold of a new one.

Curious. You enunciate it does this regardless of the time you set on the timer, right????
How do you connect a on/off switch to...
Their Baaaaaaaaack. :o)