Ok, so I have an Epiphone SG, and on it there is a rhythm/treble switch. Whenever I switch it(like from treble to rhythm or rhythm to treble) the sound gets cut off in the amp. After strumming a little the sound finally comes back. Now I know it's not the cable because I just bought a new one and its doing the same thing. Is it the guitar or the amp(Line 6 Spider III 15)? Any advice on what to do?
My Gear:

Epiphone Limited Edition '66 G-400 SG
Fender Standard P Bass
Ampeg BA115
Boss Metal Zone Pedal
Electro-Harmonix Memory Toy Analog Delay
How long have you had the guitar? I've got a gibson explorer that had faulty wiring, that might be your problem. If you're not afraid, i'd play surgeon and see if anything is up with your guitar's wiring
If it's really a custom shop SG I doubt that the wiring is your problem... try it on a different amp first, then if it has the same problem, you should take it in to a tech.
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What the hell is a G&L.

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Gay & Lesbian I think, the box smelled funny
Greg what did you send me??
Dodgy wiring, take it to a tech or electrician,
Actually called Mark!

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People with a duck for their avatar always give good advice.

...it's a seagull

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i wanna see a clip of a recto buying some groceries.

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^He said it was an Epiphone SG not a custom shop SG

Look at his sig.
Sunn O))):
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You could always just sleep beside your refrigerator.

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Look at his sig.

ok nvm lol. But still is problem seems like faulty wiring.