Yes
Been using KMC chains for years with no issues, various combos of 8,9 and 10 1/2/3x speed
Built new bike up 11 speed and chain broke on 2nd ride out,2 links literally disintegrated at the same time, not even under any great pressure (JRA!), snapped straight through the links
Next ride out and same happened again
When I took chain off and inspected it there was about 12 more links all with hairline fractures forming, on both inside and outside plates
I thought it could be stress fractures from the extreme chainline but a few people dismissed that, anyway the guy I got it off replaced it under warranty with a SRAM chain that has been fine ever since
General opinion was it was maybe from a dodgy batch of chains
It was one of their mid range chains, not the cheapest but not the fancy hollow pin ones
OP I would recommend removing your chain, giving it a good clean and inspecting it, I bet there are a load of hairline fractures just waiting to go
And yes the quick links are a bugger to remove on 11 speed, probably why they say they are not reusable