Hi guys, this is my first post here!
I'm posting to solve two really annoying problems.
First of all the random freezeing. I've been playing Skyrim since dayone with no problems, very good FPS, graphics, sound, everything.
Unfortunately yesterday I decided to buy Dawnguard and Heartfire to be ready for Dragonborn as soon as possible.
After this the game updated to 1.8.151.07 and from there the chaos started.
I have a constant 50-60FPS but in some cases the game freezes for few seconds from 1-2 or even 5. Completely Random. Even in the menu navigation or simply watching at the ground. After 2 seconds of freeze the game works nicely for about 1-2 minutes and then freeze again.

I tried everything:
1)Clean install
2)Cache Integrity trough Steam
3)Process Priority
4)Removing all the mods i had (Usually 3 or 4)
5)Reducing CPU Clock to standard.
6)Delete all the savegames and leave only one.

Nothing.
This is the most annoying, but few hours ago i also noticed that the game started to switch from 1st person camera to 3rd person automatically even when i don't use the mouse.
Now, is this due to a fail update or is it solvable?

Here are my specs:
Intel Core 2 Quad Q6600 3,50GHz
4GB RAM OCZ Reaper 1066MHz
NVIDIA GeForce GTX560 Ti DirectCU Top II by ASUS
Tagan TG600-bz piperock 600W+
ASUS Formula Rampage x48

I also monitored my temperatures and there are no problems.

Thanks in advance! (And sorry for my english.)

EDIT: I noticed that starting a new campaign i haven't any broblem. So i guess it's the savegame. But how can i fix it so?
EDIT2: Solved the third person with Hex editor, but still nothing for the spikes.