A couple friends of mine had a similar moment, except they were on the 4th
thermostat, not the 2nd. Turned out that a relay on the furnace had been
sticking. I was able to troubleshoot, diagnostic. Find the sticky relay, and
replace.

In this case, long magnet tip nut setters were needed. And some skill in
wiring, and troubleshooting.

Christopher A. Young
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wrote in message news:216cb487-b8d6-44d6-a66b-

But given the overall picture, I'd say that whatever the
thermostat is controlling at the other end is having a
problem. And I'd try to figure it out fast, as if that is
what it is, next time it might not shut off at all.