Not this exactly. But I've found, when the machine warms up, the shifter often goes dead on downshifts.
You step on it, and it doesn't shift. Can't shift up or down. Letting out the clutch a little gives a
>snap!< and the lower gear pops in. Often the next gear down does the same...that's a 5-4 and 4-3 shift.
By the same token, I frequently don't get that satisfying
snick! in upshifts, although the gear goes in. Sometimes if I hold the shift lever up, it will snick when power starts to apply; sometimes not.
This is the third metric bike I had that was this way; the other two were Yamahas. The first one was used; and I wrote it off to wear. The second one was new to me, and I passed it off as my damage from sloppy shifting.
Third time, on a nearly-new Suzuki...something's gotta be up with the basic rachet design....