I have been having freezing issues in the Falkreath home I thought it was just my xbox but it is the house itself evil thing!
Check items in your inventory especially in the keys section. There was a glitch that caused a certain key to duplicate into the thousands.
I know when I was moving all my stuff from breezehome to lakeview manor (falkreth). Since I had tons of items the game slowed down when loading interiors, Or when I would open a chest, container, etc to place my many items into.