If you are using any version greater then 129 there is a backup made for you..
This sounds like a hardware issue i would start by backing up all save game content and doing a full system restore you will have to check the documentation on your system of how to do this... format your flash drive before retrieving all saved data from the system if you are on xbox360 there might be a way to back up your updates and game content as well I'm not sure but I don't think you can do that on ps3.. format your flash drive try again if it still happens this sounds like an issue with the video so i would try a system restore if it works then cool if not call the system manufacture and see what they say do not mention that you are modding a save file.. you are the only one i have ever heard this happen to ever...
This sounds like a hardware issue i would start by backing up all save game content and doing a full system restore you will have to check the documentation on your system of how to do this... format your flash drive before retrieving all saved data from the system if you are on xbox360 there might be a way to back up your updates and game content as well I'm not sure but I don't think you can do that on ps3.. format your flash drive try again if it still happens this sounds like an issue with the video so i would try a system restore if it works then cool if not call the system manufacture and see what they say do not mention that you are modding a save file.. you are the only one i have ever heard this happen to ever...