Range goes into lock out mode

In Sept. I had a new GS563LXSS range installed. Sometimes during heavy rain and wind storms the range would automacally go into a lock out mode. The computer panel was replaced, electricians checked the outlets, plumbers checked the gas line, appliance people from 3 different appliance centers looked at it, customer and technical service at Whirlpool were cotacted. Nobody ever heard of this happening and had no solution. The stove was replaced with the same model # in Feb. 2007. The same thing has happened twice. The electrician put the range and microwave on separate circuit breaker, the power compny said they checked the transformer.The range was attached to a generator to make sure the problem was not coming from my electial hook up. Once during heavy rain the new range went into lockout and when it was attached to the generator when resetting th e clock it went into lock out mode. Why, do you think, this is happening?