LIII Music Man Bridge Pickup Issue

I’ve having an issue with my LIII bridge pickup. It has the new Music Man pickups. It sounds great. The problem is, about 45 minutes to an hour into the first set, the pickup drops volume. I mean it is super quiet. Pos 2 and 3 then sound identical (like the middle pickup). The pickup never cuts out, it just loses 75-80% of its volume. But at a gig, that’s unusable. Twice I have sent it back to Music Man. They cannot see an issue. I sent sound samples of the phenomenon but they can’t…

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