Hi John,
Kidding maybe... definitely deterioration in the barely adequate wiring in the 240 for the solenoid when the temp is extreme, if you can bypass it and get it to pull in.
There are two coils in the solenoid; one to pull in and one to hold. I think the wire gauge bringing the battery from the ignition switch through all the connectors, neutral safety switch, etc. is barely adequate when new, but I haven't pinpointed any particular spot in the 240 much less your 940.
I put this on my daughter's car a year ago thinking she may never have to use it, but she has, once.



Hard to pinpoint in the time you have after the engine compartment cools, but I think I've read stories saying a replacement solenoid / starter doesn't fix this common issue.
--
Art Benstein near Baltimore
Those who race through life finish first. (Darrel Hunsbedt)
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