'86 Chevy 3/4 350 ignition mystery. I turn the key and get nothing. No click or any indication that any connection was attempted.?

Dash indicators come on. This has happened 4 or 5 times days or weeks apart over the past months. After 3 or 4 tries it has always started... until Monday when after repeated 9 or 10 tries including moving shifter and steering column (adjustable) I tried later in the day and the next morning to no avail.

I had the truck towed to the garage where they could NOT get it to fail. They tried all day Tuesday and today as well. They did not want to start replacing parts randomly (starter and a nearby relay are less than a year old) and did not think it was the ignition switch. They said it could be 'something' in the column.

Thoughts, ideas, suggestions? HELP!