Everything can be working perfectly. Then I shut down. The next day when I try to fire up again, I have multiple malfunctions with problems that are totally unrelated to each other.
Just think of the problems if you used wire wraps instead of solder - like those old computers of yesteryear.
"Well it worked fine the last time it was on." (Famous words of consumers - and critical info to give the repair tech)
I think connections, PC boards, connectors, etc., go intermittent from the temperature generated expansion and contraction of the metal around them. (Especially rigs with big power, heat and all that schtuff.)
T
