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take a look at the switch and see if its actually doing its job on the middle position...
if you're familiar with gibson 3 way swiches you'll see that when you toggle it you are actually making or breaking one of 2 connections. The connection that's "closed" will be the pickup you hear. When in the middle position both connections on closed so you hear both pickups. Its possible that for some reason the middle position isn't engaging both pickups.
You may need a new switch.
On a side note... why don't you play that guitar more?
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