Originally Posted by well biked

I wonder if the c-to-c spacing between the chainrings on the 11sp crankset, when used with a 10 sp chain (if that's what you're doing) might be the problem. If so, when you get a bit cross chained when in the small ring, the slightly too-wide chain for the cranks might be hitting the big ring and causing the malfunction. Otherwise, it seems like an odd problem. I thought of this possibility only in theory, I don't know what, if any, difference in c to c spacing between the chainrings there is between Campy's 10 and 11 sp cranks, I just thought of it as a possibility. If this does turn out to be the issue, you could likely run an 11sp chain and have it work fine with your 10 sp cassette. Good luck getting it figured out