I noticed while I was in Portland last week that the server was down. When I got home, I discovered that the UPS was off. I pushed the button and turned it back on.

A day or two later, it was off again. I eventually figured out what it was:

The causes of the outages

Penny likes to sit atop the UPS. The newest member of our family likes to swat at Penny. Apparently, sometimes she hits the UPS power button instead.

I taped some cardboard over the button. I do not anticipate any further outages.