My Coffeemaker stops & starts and doe...

I've had my Keurig plugged in but not turned on for about 1 month. Before I put it to ''sleep'' I gave it a thorough cleaning using the instructions given by Keurig (vinegar & rinse). Anyway, I went to use my P60 this morning and what a nightmare. None of the cup level buttons provide the correct amount of water anymore. If I push a small cup the brewer spits out some water then pauses and then starts going again and overfills the cup. On the Large cup level the brewer seems to be somewhat accurate but not like it used to be. The only way to stop this is to turn the machine off. When I do that, and turn it back on, water spits out into the cup and then it goes back to heating mode. Any ideas?