For no particular reason, the space on my SSD keeps disappearing even though nothing has been downloaded/installed. I'm on a base 13" MBA 2011 model. Space is already scarce but I always try and maintain at least 10GB of space. The space slowly keeps disappearing until it reaches 0MB left. I then restart and the space reappears, but I don't want to keep doing this. I'm doing nothing to make that space decrease. I've used WhatSize to figure out the problem, but nothing came up. What can be going wrong?