So I was headed home today trying to beat the rain that was incoming. I take a corner pretty slowly then accelerate kinda hard. About 6.5k rpm's. Now I know how to shift and it wasn't me just not up-shifting hard enough. Anyway, 3rd gear goes by fine then when i switched to 4th it caught, I hit the throttle and it started to pull, then all of a sudden nothing...rpms popped up and the bike revved. I immediately let off the throttle and right as i was starting to pull the clutch in I heard it catch....I clicked it to 5th gear and it took off just fine...I have noticed my clutch has been a little hard to pull and the shifter sort of double clicks hard each gear especially if I'm taking off fast. I just had the bike serviced at 7.5k miles about a week ago...The chain slack is right at 1-1.3'....Thoughts?