The ESP Guitar Company

I have an EC-1000ET see thru black with the factory Seymour Duncan pickups it comes with. The neck pickup after playing for a bit if I switch from bridge to neck the neck pickup has low strength and sounds muted. If I pull out the push pull pot it works fine but if I push it back in back to low strength and muted. The bridge pickup works fine for both the push pull pot in and pulled out. Any ideas what this could be? I’ve already replaced the 3 way toggle thinking it might be that.