Forgot to add that the Error that came up, came from within the game itself (green text from the chat log) and not a White box pop-up like i have encountered before.
I managed to have similar fights today, on lv 26/27, i also did not use rico/ and my multishot was only +4. It was still very laggy.
While the Error never occured today, the amount of sorc's were always manageable (atleast till my death, it got super crazy again lulz) i made sure to take extra time to finish them off to reduce the chances of replicating such insane fights.