I have been playing a new Gibson Byrdland through a Fender Twin Amp recently but after playing for a couple of minutes, if I move at all, it crackles - the noise is like a static discharge crackle. I have checked all connections and everything in that department is definately all right. I have tried a number of my other Gibson using the same set up and it never happens. If I stand perfectly still its all right and after it happens its allright for about another 15 seconds then it happens again. I have been playing professionally for 40 years and I have never come across this before. If anyone has any ideas what is causing this and how to correct this I would be very grateful.