Or something . . .

Here's the wierdness, I had some wonderful CS 69 pickups installed in my Strat a couple of months back and everything was groovy. Then one day the neck position on the 5 way switch went silent. I pack up the guitar and head off to my trusty repair guy, who checks it out and says the switch is bad (sounds reasonable). A quick switch replacement later and everything is good in Stratland again, until it wasn't. Again with the neck position not making sweet bell-like tones (or any noise for that matter)!

So it's back to the repair shop I go, where upon plugging it in to an amp, both Roger and Chris look at me like I'm trying to sell air conditioners to eskimoes. Yep, you guessed it, the neck position is working just fine. We muck around for about 30 minutes; each playing the guitar, switching into and out of all 5 positions exchanging looks, comments and smirks trying to get the neck position to fail. I must be crazy right? It's working fine. Well I get it home and everything is groovy again, and then it's not, and then it is. WHAT THE HECK!

Alright lads, does anyone have experience with this phenomenon? Any and all reasonable explainations/suggestions will be entertained. It's a 2006 American Standard Strat. The only mods are the CS 69 pickups and the greasebucket tone circuit.

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"Life is like eating jalapenos. What you do today may burn your arse tomorrow"

Could it be that your tech has been a little heavy handed with the switch and bent the contact lug for the neck pickup. Or could the problem be the hook up wire onto the pickup. A intermittent short maybe that becomes broken when the guitar or wire is moved.

You could check that with a multimeter on beep/continuity setting. One probe on the wire to the switch. The other probe onto the solder blob (where the thin coil wire joins the hookup wire) on the corresponding side on the underneath of the pickup.
If thats all ok, set the multimeter in the 20K range. Check from the hook up wire to the opposite solder blob. Repeat for the other side too, so you check both black and white wires.