The UPS that my son and daughter-in-law use upstairs is acting up. A few weeks ago I was using a circular saw outside in the back yard with the extension cord plugged into the outside outlet. Whenever I would use the saw, their UPS would cut out and reset itself. I had to run another extension cord around the house and to another outlet in the garage. Just now, my son came to my computer room to report that, when I started up our clothes dryer, their UPS, again, cut out and reset itself. I had noticed that I had also lost Internet when I came back to the computer. Our modem is connected to their UPS. BUT, in this instance, the clothes dryer is on a 220V circuit all by itself...not on the 110V circuit the UPS is connected to. We're scratching out heads as to why this UPS is behaving so badly. Any thoughts?