the blower motor stops by itself. We've noticed that when this happens, the signals and windows stop working and the door locks click. And when the switch is turned off there is a buzzing noise around the switch. There is a plug and a box below the dash by the steering column that vibrates.
A light tap on the side of the dash by the switch gets things going again.
Does anyone have an idea what this is and how to remedy it??

 

Sounds like the integrated control unit. Take some pics.