Late last year I purchased an Ibanez JS2400 guitar. Until now, I've no problems. Currently, when I pull up on the whammy bar, to increase the note pitch, several strings go out of tune, anywhere from 1-2 semi-tones. It happens fast and immediately. Pushing down on the bar (to deepen the pitch) does not do this. The strings are held in very tight, or at least tight enough (no string slippage). Any suggestions on this floating bridge problem?