More often than I can count, the long journey has ended with a straightforward fix.

This was one of them. Intermittent faults are the ones that get your brain working. No pattern, no error code, machine runs fine for days then stops without warning. Power cycle, back to normal. Repeat. When someone says it happens randomly, that's the signal to look harder, not accept it. Attention to detail is what separates a proper diagnosis from a parts swap and a prayer. The photo says it all. Screws too long, plug not properly secured. The slightest vibration or movement interrupts the connection. Machine stops, customer power cycles, runs fine for another few days. Meanwhile the waste from every unplanned stop is quietly adding up. The fix took minutes. Finding it was the job.