PC: BF4 Campaign Crashes and Problems

I got into the Tashgar mission for one time, but i had to restart the mission because when i was spotting enemy with my binos i spotted one enemy glitching outside of the map, he was walking down a mountain that wasnt part of the map, then he somehow came into the big thing that keeps the water on the other side ( cant remember the english word atm and im too lazy to use translator), and after that he jumped down again, then i saw how he felt under the map and keep falling down, the mission had to restart because i had to kill all  the enemies but i couldnt because that one enemy was glitching. after i restarted it crashed just where the video ends.