Crashes related to Chain

Lately, I have been having an issue that crashes all players in an instance, which I believe is related to the chain mechanic.

-The clients of all players crash, but the instance remains intact.

-This has been occuring once or twice per day

-it always happens immediately after hitting a large pack with skills that chain, usually sea witches or monkeys.

-This is occuring with Lightning Strike (20%Q) linked to chain as well as with Arc. I haven't been playing with anyone else with skills that chain

Is there a possibility that there is some error in the calculation of chain that is causing this?

Might be graphics overload like using Vaal Cyclone with lots of monsters on the screen.