Have a samsung 840 pro 512gb. Past couple of weeks its started crawling to the point of locking up the computer. Ran the samsung magician software to test it out. All tests came out good except the random write (IOPS) with a real low score. Smart status still shows good health. Its not even half full. Figured it was getting ready to bite the dust. I start deleting all programs I have installed to get ready to nuke it and do a reinstall. its my way of writing down the app, then delete it so I know what to put back on. here is the kicker. Decided to run the test again. Now the random write (IOPS) is back to the high mark as if nothing is wrong. Am still going to nuke it but wondering if its still ready to bite the dust. Opinions? Thanks.