OK I have an Agile Strat Clone, I put in Fender Vintage Noiseless pickups, and have been playing that guitar for about 10 years every third practice day. So several years ago I was playing along and the volume on the guitar/amp started to diminish a little bit. Of course I thought it was tubes, so I bought some new ones. Everything was Ok for a year or so. So it happened briefly several times after that year or so. Playing different amps. So I thought it was in my house pedal board. I checked all the connections everything seemed Ok.
So after I started using my road board in the house a week or so ago. it happened again. (I was always using the front pickup as I recall when this happened every time). Only this time the sound crapped out fully, before this time it only diminished a bit, then would come back. So I figured it had to be that front pup because I switched the pups and it popped back on, when I switched back on the front pup it had that deep hum like there was no ground, I switched it back and forth a few times to clean the switch up a bit and it returned to normal. So I got out my contact cleaner and sprayed the 5 position switch with the contact cleaner. Of course this is the first day I played it after the fully crap out scene a few days back, but it seemed to work OK so far. Only time will tell if it stays OK. But if I have to pull the pick-guard, I also have to remove the neck. If I do that I am putting some Duncan Little 59'ers and a new high quality 5 position switch. $269 for the three pups and a new 5 position switch. I may also take that 5 position switch option off the table and use 3 mini off and on switches which gives the option of having all pups on all at once, which gives a pretty decent mildly thinner sound that you can't get with the 5 position switch.