I have a Ridgid shop vac and a Ridgid 5" orbital sander. I have had the sander for just over 2 years and frequently hook it up to my shop vac to keep the dust down. Just a couple of days ago I was doing this and my sander suddenly stopped. It didn't make any noises or have any burning smell, it just quit like someone unplugged it. The light on the plug was still on, so I know there was power to the sander. I removed the cover of the sander and tried to check for electricity with a little meter and couldn't find anything. I took it back to HD and got a new one 2 days ago. Last night I was sanding again and the new one did the exact same thing, it just turned off. I have noticed that my shop vac has been making unusually high amounts of static electricity and I was wondering, could the static electricity be shorting out my sander? While sanding I was continually being shocked. I have heard that there is usually more static electricity in the winter, and I live in Utah where there is zero humidity, do you think its possible? I want to fix the problem instead of continually returning to the store for new sanders. Any ideas?