(No worries. I'm glad you took a vacation. :-))
Sent it off today. Thanks!
One thing I was going to try but didn't get a chance was plug it in while the car was already on. If it didn't freeze then there was probably some sort of spike or brownout issue. But I forgot to try that. :-o
I don't have a DC generator or I would have tried to test how it reacted to various voltage states.
So when it gets back hopefully it will work like a champ. Otherwise I'll look into creating an rlc circuit (though I'd probably need a few hints on which cap, resistor, inductor to purchase.)
Thanks for all your help!