as the other guys have said, check the tyre for damage/foreign objects, also check the rim for damage,,, is the rim tape ok, are any of your spoke sticking through,,,
both my brother and myself used to run kenda tyres, (nevegal) we always used to get punctures with those things, as the side walls were to soft, even running them at 40+ psi, we now use maxxis tyres, col runs minions on his chromag stylus and ns soda, and advatage on his santa cruz butcher the minnions on his ns soda are dual ply dh ones, and his other 2 bikes are single ply,
on my bikes (chromag stylus, knolly dt) i run high rollers both dual ply dh, for the past 4 years on my hardtail i have run swampthings dualply dh,
we do get the occaisional puncture usually caused by hitting somthing hard like a rock or root,
when my swampthings wore out back in march, i thought i would try something differant, i got a pair of schwalbe hans damf, i had 3 punctures in 3 rides, even running them with almost 50 psi i was still flatting, as the side walls were to soft, so i binned them off and went back to maxxis,