Because I pressed too many buttons on the microwave..
He likes to push the 10 min button and then start, than stop the microwave when it's been long enough. So only 2 'beeps' when pushing the buttons.
I like to put in the exact time and walk away. So numerous 'beeps' when pushing the buttons.
A whole day dedicated to fighting about how many times I pushed a button. I still do it my way, when he isnt home.