Okay when I first started playing far cry primal I never had not one single bug or crash through 31 hours of gameplay and completed the entire game.
I completed all the side quests and main quests and side activities and wiped out all outposts and completed everything I could until I completed the final boss mission ULL and YURI final boss quest missions.

I defeated all the enemy tribes and completed 31-32 hours of exploration and quests. and I never went through a crash or bug .

my second time I played I adjusted the brightness to high gamma and I had issues with freezing and crashing .

I also got bugs as well throughout the game taking place.

the game is okay but what did I do wrong? are the bugs fixable?

what causes bugs and what causes crashing?

other then that now my game far cry primal runs better and smoothly and the bugs have vanished?

can someone explain to me why this happened?

Thank you.