I had tried restarting it. When I tried to do a persons advice in this post deleting the caches, I accidently deleted everything. So every was the same when I got the computer. I managed to fix everything back except for the missing space. I am currently taking desktop photo's to show how much free space is going down. I am not going to download or save anything on my computer to see what happens. If this continues I will take to my local apple store. Also the S.M.A.R.T status said verified so something else is happening.