https://www.pcgamer.com/monster-hunter-world-has-a-major-crashing-problem-but-a-fix-is-on-the-way/

While our early impressions of Monster Hunter: World's PC release were largely positive, they've soured over the weekend. After 10 more hours of play, and a plenty more between the rest of PC Gamer, it's clear that Monster Hunter: World has a significant crashing problem. We reached out to Capcom for a statement, and luckily the development team is aware of the issue and a fix is on the way. The exact timing hasn't been detailed, but we'd expect to see it before Monster Hunter: World launches on PC on August 9. Until it's fixed, here's what's up and why we think it's happening. 

Over the course of a four hour session, I saw about one crash an hour. Worse, when a crash occurs during a hunt, you lose all progress since the last save. Monster Hunter: World automatically saves after missions, but any significant crafting or item management between hunts goes down the tube. Quick load times are something of a salve, but hopping back into a multiplayer hunt after a crash after too much time disqualifies you for rewards attached to the quest. You'll still get to harvest the beast at the end, but no bonuses for you.