I have similar symptoms as you - roof intermittently doesn't work at all, sometimes seems to be related to temperature.
In my case, it's definitely the part with the two microswitches under the latch. If I take the switch out and fiddle with the switch that senses when the roof is un-latched, I can get it to go - I've just been two lazy/cheap to replace it. One trick I've found is that if I stick my fingernail in the hole where the latch goes and pull down on the plastic flap in there, I can usually get it start working.
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'99 986 Ocean Blue Metallic
'87 924S, winter beater
'17 VW Golf Sportwagen, for when I need extra seats
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