The only time I've ever ran into the situation you're writing about was on a buddy's R6, while seeing AMA at Road America. Same exact problem. While there we figured we hit the information motherload because of all the bike techs.
Hitting up one of the Yamaha guys, he said it was definitely a bad (worn) chain, and had us do the following, so we could make it back home without having to wait an extra day (we had rode to the track from Iowa)
He said it was a long shot, but he had us spin the tire till the tightest spot was rolling over the back sprocket. Then he put a small screwdriver into one of the teeth, and forced the wheel to rotate and stretch the chain slightly. Then he adjusted it to be fairly loose but without a ton of slop. It worked. With a LOT of luck we made it back to Davenport, where the chain snapped about 2 miles from home and we were lucky no one got hit with it.
After a new chain, all was right with the world. My buddies sprockets were good, and he's had many track days since with no issues. I'm sure there are lots of other variables to consider, this is just one story and lucky conclusion.
Seems logical with such a powerful bike that over time it would be easy to wear a chain with hard launches and such, especially if its the same one you bought the bike with.