PLMV169DCD Microwave RUNS WHEN DOOR PULLED!

I own and use the 'D' revision of Frigidaire's "Professional Series" Microwave (Model: PLMV169DC), and have been using it quite reliably for slightly under 1 year. It functions well and certainly looks handsome amid the other Frigidaire appliances we carefully researched and purchased last July.
I'd agree with anyone who says $300-400 is too much to pay for "just a microwave" and this unit is no exception -- I felt we were paying for its good looks and above-range installation motif.
BAD NEWS: This morning, I discovered that the microwave oven 'runs' whenever I tug gently on its closed door! With no time set on the timer, and having pushed none of its soft-touch buttons, the darn thing just starts humming along as though it were cooking something, and it will continue doing so as long as I'm giving the door a light pull (as if I'm about to open it).
Luckily, the COOK indicator does not light nor does the turntable spin when this happens, but the humming sound (to my ears) mimics that of the "cook cycle" and not the "pause between defrost cycles" fan noise. So naturally I am concerned and will be reporting this issue to the outfit who sold (and warrants) this unit. Further testing revealed that food items are not being heated when this occurs.
We feel fortunate to have been sold an inexpensive extended warranty -- something we NEVER do, period -- as a precaution against lightning-induced damage to circuit boards, etc. Such was the advice of several repairmen who correctly noted the high cost of repair, not to mention replacement, of such critical parts. Here in post-Katrina New Orleans, one cannot rely too heavily on the quality of our power lines, particularly since some flooded-but-ungutted homes remain connected to the grid. Outages and spikes are a common occurrence around here, and expensive electronics always seem the first to suffer! I'm posting this review as a mild warning to anyone in a similar situation ... go test your own microwave's functioning. I doubt it is an intentional behavior.