Microwave Underlight Will Not Turn Off

My microwave under the unit that shines on the range will not turn off by pushing the on/off button.

I can turn the light on with the button and off but within seconds of turning it on. If it sits for 1 minute or so then when I push the on/off button it will not turn off.

Any thoughts.

Thank you.

Rich

Answered here: http://forum.appliancepartspros.com/microwave-repair/79159-whirpool-underlight-will-not-turn-off.html#post190312

Gene.