I think something is wrong with the microwave...

I think something is wrong with the microwave oven at work. I wanted to heat up my lunch so I thought maybe 100 seconds would be long enough to do the job. I put in 100 seconds and pressed the "start" button. Immediately the digital readout went from 100 seconds to 59 seconds, then 58 and so on! It missed an entire 41 seconds!!! Luckily my lunch was warm enough anyway when the clock got to 0.