in case anyone does a search, here's the culprit: clogged drain pipe! When I called Munn's and they were scheduling a warranty service call, I described the problem, including that it seemed like it was on for 6 hours, and then shut off for 4 or so. He said to fix it, take off the cap for the pipe that's by the air handler, then go outside and put suction on the pipe with a shopvac. I did that and got a "whoosh" of over a gallon. When the water sits in the pan, a float will trip the safety shutoff switch and turn the system off to keep from flooding your house, garage, whatever. With the system off, the water slowly drains and the system resumes normal operation.
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