Between me and a few others, I noticed several crashes at the very beginning or during combat today, and experienced two myself. Both of mine were in the middle of massive swarms of enemies, luckily none resulted in any catastrophic losses and one of them, I even survived to the end because a wizard buffed me to be an unstoppable wall of autoattacks. Someone else happened to crash in the battle where I unfortunately died. The funny thing is they survived with almost no HP and recovered me to be resurrected while the battle was still going on.
I'm too new to know of the anticheat measures, but I hope no one is unfairly punished as a result of these crashes. They often return with apologies in the middle of combat and do everything they can to help their battle-buddies out. I am willing to ignore it for love of the game, but I can't imagine the stress higher-level players have. I use a 2gp weapon and take little damage because of heavy armour and a shield gifted to me by a very generous player. But I imagine when the higher-levels are out there trying to adventure, their skills become awkwardly blunt when the game stops working, potentially sullying their Ravenloft experience as they drop a 1500gp weapon to something they may have easily slain or just barely survived otherwise, and need to incur huge resurrection penalties. Money comes back but moments like those are kinda hard to forget.
This may look off-topic, but I just wanted to share my experience with how common this seems to a new player. In short: I fought through two dungeon areas today and experienced a crash in both. I am also not the only player to have crashed in those dungeons. I hope Beamdog is able to fix it soon, if they're even aware.