Since downloading Dragonborn, I have had freezes, crashes, lags, and hard crashes where I have had to up-plug the XBox itself and restart the Xbox. It has been found out that the autosaves are causing three fourth's of the problems. I have turned off ALL my autosaves, and just do hard saves very, very often, and every hour or so, I go to the dashboard and clear the cache. It was also recommended that I keep fewer saves on the hard drive, and keep them down to about 6 because the extra saves take up memory. Since I have been doing this, I have had no more freezes, no hard crashes or crashes of any kind, and only a minor lag here and there.
Yes extra saves take up memory, on hard drives that usually have a fair few gigabyte of free space, the amount of space they take up is not really that significant, you can have a lot more than just 6 saves, you can have 40 and it is not going to affect your game unless you are actually running low on storage space. And clearing the system cache every hour or so is a waste of time and probably not a good idea while you are playing. You do it once, and then delete the DLC, patch and game if it is installed and do a clean install of the game, patch and DLC. Then you do not need to do it till your game starts having problems again, which should not be till at least the next DLC. You can clear the game cache each time you start up the game, that is not what you are doing.