it actually happen to me a few years ago: during a pub gig, after a couple of hours of standard playing my Ibanez GWB35 completely... muted and there was absolutely nothing I could do: put a new battery taken from the pub TV remote, some tweaking/shaking into the preamp... the output jack... nothing. Luckily the owner of the pub had a ugly 100 euro P/J bass lying somewhere, one with the pointy Jackson headstock, you know? I quickly made it barely playable by the tools I had in the bag; the J pickup was unusable. The P pickup saved our gig, instead. No flashy solos, btw... Needless to say, on the next morning the Ibanez bass returned by itself to full functionality (I did nothing)!!! Then, to avoid this again I contacted the seller and so I had a new Ibanez preamp from BassNorthwest, where I bought the bass, sent to me here in Italy; I installed it and the bass played ok and served me for quite a few years (maybe four?) without problems until... one month ago: it muted again!!! COMPLETELY dull and zero signal coming out for no reason!!! Luckily it was at our rehearsal place that only is a few km from home; I went and grabbed another bass. On the next day the bastard was 100% functional!!! So you understand that I had to decide if throw that bass away or fix it: I removed the Ibanez pickup and electronics, trashed them and had Mr. Magnetics build for me a new pickup and electronics, with the middle (3 khz) area a bit more evident. This bass is now like "born again" and sounds like a 3k instrument!!!! Do I love this bass now? Yes: it's an excellent axe that I will never sell. Will I buy Ibanez anymore? Uh... no, thanks!!! BTW: this also happened during a wedding gig to my beloved CAR Skyline 5502 (bart+bart); only thing is that luckily enough it has the pull bypass "lifesaver" volume knob that avoided us to be shot on the spot, I suppose! It was exactly the same situation: there was nothing I could do to get the bass working for the entire evening! And on the next day it worked perfectly: not a battery issue, or a jack, bad contacts etc. And on the next day everything returned perfectly normal... Anybody else had this problem, ever?