there a reason my game went from yeah, really good, no game hick ups, so texture issues, quests aren't bugged that you cant finish them to like... everything i just said?

i run around the game, I'm seeing parts through the world. I'm in a cave, and i can see a big fat triangle that when i look through it, i can see the outside world! i can see the sun and everything! and I'm well deep into this cave where there shouldn't be no giant ass triangles that deify reality... but i could possibly look past a few of these issues... but my main issues is that fact that!

i Cannot complete a lot of quests or world places i go to is because its bugged... okay... example... i got to a bandit camp, and there's a bandit leader who has a key to a cage to let someone out... fairly simple... i kill everyone, very simple enough... cant find the bandit leader... so i look around and i finally find him, hes stand still. not doing anything. i hit him, he doesn't move. i kill him. and hes still alive and doesn't drop any loot... wouldn't be a big issue... but the fact is i needed his loot to get the key to get the guy out of the cage... now that's just a side thing...

I'm at a quest where i need to go in the dungeon and kill some guy from the wild hunt, i get him down to low health because hes not moving, then he pops a shield and summons these little dog things... while the dog things are up he gets a shield that you cant attack him, so i killed the dogs, and once again, the bugs set in, he still has his shield up, and hes not moving. every time i got to attack the shield. it takes off like. 25% of my health or something... so i cant complete this MAIN story line quest to move on with the game... it does it for a hand full of side quests and other bandit locations around the game... ill see if i can attach some photo's or something soon. but its a big bloody stuff up if its to do with the new add-on there bringing out.

Sorry for the long post. trying to give you an idea on what I'm dealing with...