Ken

You did not mention if the battery was tested. Or how about trying another "GOOD" battery just to see what happens.

The problem with heat and the module is just that, you have to build heat for the problem to be apparent to the best of my knowledge. It's unlikely you'll see the heat required to present a problem until you've ran the engine for some time. You mentioned the problem occurred right after you started and warmed it up. I'm still thinking battery....

In any event theres nothing wrong with sending the ignition off for a check-up...