I also want to thank you all for the prompt support

@bone: Does this happen when you gear up, or down, or both? I noticed that, while gearing up, my boots occasionally touch the "helper" of the side stand (don't know the name of it). Mostly when i stand on the pegs, the rotation of my foot makes my boot touch the side stand. It is not enough to move it that much so the side-stand-switch turns off the bike, but maybe your switch/boot/anatomy is somewhat different ;o)

Thats amazing Capt Moto diagnosing a bike without seeing it.How do you know that there is no problem with clutch adjustment.These things can be marginal and are always best eliminated as it only takes 2 mins to check.If the knurled adjuster on the clutch lever vibrates loose then the adjustment can change and the clutch may not fully disengage contributing to cutting out or stalling when the gears are disengaged or selected.Also XT's have this adjuster underneath a rubber cover so it is not something that you would see unless you specifically looked for it.All views welcome.

I detect a hint of sarcasm. Look pal, of course I can't give you a definite cause of the problem without seeing the bike, I am not a magician but you know what funny man, we've been dealing with these bikes and their common issues almost since time began.

As for Kev what he doesn't know about the XT's its not worth knowing, personally I don't have ANY mechanical expertice or knowledge, as I am more of a bike abuser than a mechanic but, having owned the same bike for long enough to know what is likely to go wrong and also having run this forum shoulder to shoulder with someone with the knowledge and experience of Kev, I can confidently say that working by eliminations and suggesting to check the most common faults first, would help myself and Kev to figure out what is the cause and then suggest a solution, bear in mind that the OP has stated that his mechanics couldn't see anything wrong, if they are only half good they would have spotted an insufficient clutch "bite" and let me also remind you these clutches have self adjusting plates that even with the slightest of "play" in their action will eventually do what is designed for them to do and that ultimately in our experience, problems with clutches on these particular bikes have been as rare than hen's teeth.

Another vote for the side stand switch !!! Check it is making proper contact with a multimeter or if you can't just cut the wires and join together then insulate with tape.

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I had same problem with 5000 km. I lifted idle spead on cca 1500-1600 rpm and problem disappear. Today I have 45000 km.