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I would guess a "trip off" means a failure.

I'm surprised C1 isn't arcing but then it doesn't have a pointed corner. Discharges prefer point and spikes, it concentrates the charge at that point.

You could do a 'dirty' fix on a bare PCB before assembly, use a small circular saw (Dremel etc.) to cut a slot between the screw pad and the near corner of C2 pad to provide an isolation gap. If it fixes the problem and this is an ongoing product you could add it to the fabrication files and have it included in board production.

Brian.