On Wed, 01 Jul 2009 20:11:53 GMT, "The Medway Handyman"
wrote:

Maybe the electronics aren't up to the job?

I don't know. The switch has two positions: always on (like a
conventional vacuum) and controlled by power tool. Last time the tool
control failed and I was told it was the PCB that had failed.

When it broke this time, the always on position did not work but the
tool control did, for a day or two, but then it broke completely. It
seems strange the always-on should fail first this time.

Thinking out loud, do motors generate spikes as they spin down? Are
the spikes when I switch off my sander destroying the control
electronics?

Thanks,
Stephen.