It sounds like what is happening is, the SSD is suddenly not seen or "disappears" from the PC. Since it is a caching drive for the OS, when that happens Windows cannot work correctly, which forced you to restart the PC. The SSD was again not found by the IRST software, so it recovered itself, as you know. What did you do to get your PC working again each time this happened?
It's difficult to say what the issue is, the SSD or IRST. You are correct about the problems your SSD has had. It is also important to use a good cable between the SSD and your mother board. Did you try a new cable?
Another thing you can try is to change your Windows Power Options. Select the High Performance option, and then Change plan settings, and then Advanced settings. In the Hard Disk entry, set Turn off disk after to Never.
I don't know what mother board you have, but if in your BIOS, in the SATA configuration screen, if you have a SATA Link Power Management option, set it to disabled. IMO, the Windows power saving options that work fine with HDDs, do not work well with SSDs, and cause some of the problems SSD users have.
If these things don't work, the Samsung SSD would be a good choice, and so would the Intel, IMO.
well it only has happened three times both after uninstalling software, windows 7 had not closed correctly.
well as far as i know the SSD is always present i think it becomes corrupt.
What did you do to get your PC working again each time this happened? Deacceleration.
I can try what you are telling me but corsair thinks is the ssd itself, so maybe i should buy a samsung...