Sounds like a mechanical issue to me. That would mean a loose connector,
loose wire inside of a connector, or a cold solder joint.
To start trouble shooting, you will need:
1. A small non-conductive probe - part of an old pen case will do well
as will a plastic cable tie. Lightly tap each connector with the probe
and lightly pull/push on the wires going to the connectors.
2. A can of "Freeze" to selectively spray soldered connections. Fast
cooling will often cause a failure if said connection is faulty.
Both of the above tests will cause the problem to appear and/or correct.
Gently is the operative word of the day.
In most instances, these methods will find the offending part(s). Again,
DO NOT use force when pulling/pushing connectors or wires. What you have
is slight - else tapping the case would have no effect.
Bill K-Line
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