Signal drop in the hangar at 2AM had me chasing a ghost for an hour

I was doing a pre-flight check on a 737 at the FBO in Wichita and the transponder kept losing lock every time I moved the harness near the aft bulkhead. Turned out a grounding strap had worked loose behind the panel, not a bad box like I figured. Has anyone else had intermittent faults that only show up at night when the temp drops?

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