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Every time staff pulled the dust covers off we'd get slimed.
Seriously though, the type of wire being used was of a poor quality and/ or a poor choice for the application as it was too rigid and brittle generally, plus the shielding was terrible (consistency closer to that of wax than rubber or plastic shielding).
Combine these factors with generally poor soldering and high-resistance contacts (again, poorly selected materials for the application), what you get is an electrical system full of existing and potential flaws that only worsen the more that the system is handled.
You end up with shorts, spikes, and breaks in the line which aren't immediately apparent and aren't even findable through visual inspection. Thus you end up chasing the whole line with a multimeter and having things work fine on the bench and then poop out in the body and vice-versa, ergo chasing 'ghosts' or 'ghosting'.
Many of the guns we worked on (mostly warranty, eugh) did this, and eventually after wasting so many man hours trying to save and repair these systems, the employer decided that the best course of action was to gut APS electrical systems and replace entirely whenever the wiring was in question, scrap it, and go through the leftovers during downtime to see if any of it could be reclaimed for rentals.
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