I've had it stripped out to it's individual circuit boards, it's been cleaned, air dryed and short of testing each individual (!) circuit, rebuilt it.
Still goes out of tune. There seems to be no logical reason, (heat, humidity etc...) maybe just because its lightweight and flexible, its got bashed in transit. who knows.
Gutted. Love the X50, perfect for gigging, jumping on the tube, or in a cab when moving around. Great sounds and architecture! WISH they did a 76/88 note version! I'd buy another straight away!