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Well,
As a general rule, most electrical systems will show their first sign of failure when hot.
The best clue that we have at this point is that your solenoid is not engaging when the key is being turned. Your FIRST test at this point should be to see if the positive wire coming from the key harness to the solenoid is getting 12v when you turn the key (when the issue is present). Let us know if you are getting 12v there.
I am assuming that you changed all the electrical out because of this issue??
I have not replaced all the wiring yet. I'm going to get my electrician neighbor to help me with checking the voltage.
I will let you know what the findings are as soon as I get him a 12 pack to do it. LOL. I will be learning to use a voltmeter now.
Thank you for all your help so far, I am grateful.