I got a new bike last year with 11 speed Ultegra fitted. For the last few rides I've noticed that sometimes, when I shift quickly to the smaller cogs at the rear (higher gear), the chain will be thrown off the big cog at the front. This is a bit of a pain as momentum is lost while it sorts itself out.
Anyone else had this sort of issue? I had 10 speed Ultegra on my previous bike and that worked pretty much perfectly for five years or so.