My girlfriend is buying a guitar that's a Strat copy. It's a Lyon made by Washburn. Anyway, I heard that this one guy had funny tone knobs that would start to hum and cause static if he didn't use them for a while. Then when he turned them a little the hum went away. If this happens to this guitar what could be the problem? Dirty pot? Need a new pot? Just FWIW it's got the s/s/s pup config, passive, one vol. 2 tone and a 5 way switch. Thanks everyone.