[Orokin Derelict Sabotage Game Crash]

So, I was playing Orokin Derelict sabotage, I had found all the cahes, and finished all the objectives. i was heading towards extraction when all of a sudden the game started dropping frames like crazy for a few seconds until it froze. I couldn't do anything literary anything. On top of that if also bricked my windows UI, preventing me from opening the task manager or really do anything other than shut the system down. I really dont know what could have gone wrong. PC specs: intel i5 4460, GTX 960 2gb, 8GB RAM, Gigabyte sniper B6 board, adata 120 ssd, 1TB WD green HDD.