Mine has been doing the same thing. Narrowed it down to the sail switch but I think it is the wires leading to it. Wiggle on the wires to it and it works great for days in a row and then does exactly what you described. I pushed down on the wires to the sail switch and it works good again. I just need to get the blower cover off to inspect the conection to the sail switch. I bought a new one and might as well install it while the blower cover is off.
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