hardtop s "bucks" at 3k-3.5k rpm
 

hi guys and gals,

i get what i would describe as a sudden "jolt" or "buck" in 6th gear, both accelerating and decelerating through the 3k-3.5k rpm range. its happened at least a dozen times in my 2011 hardtop s with manual transmission. i've got just under 6k miles on it, and scares the crap out of me when it happens, and there is no warning- the whole car just bucks... any ideas?
:confused:

thanks in advance!

s_d