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This started happening last week to a Carrier electric start gas furnace that is about 14 years old

It will run fine all day long cycling on and off as needed, but then late at night/early in the morning it will shut off and the house will get cold. If I go into the attic in the morning and simply remove the cover and put it back on (releasing and pressing a switch in the process) it starts working again. I've cleaned all the connections/igniter/flame sensor with no luck.

I've called someone in to look at it (one morning after it shut off again) and they could not find anything wrong either.

Any ideas?

Also, does anyone know if the cover switch is anything more than just a safety switch...i.e. the cover has to be on to keep the switch pressed in order for the blower to work, but does it also reset something when released and then pressed?

Carrier model number is 58RAV095 13116