I recently purchased an Intel 520 120GB SSD and installed Ubuntu on it. Occasionally my system will freeze and I will have to ALT-PRINT SCREEN-REISUB to reboot.

Sometimes it will reboot and work just fine. Other times it just hangs at a flashing prompt. If I boot from a Live USB I can run Boot-Repair and it will usually reboot fine the next go round. I have noticed today that when I am running the live USB and open Nautilus my SSD partitions will sporadically disappear and reappear. Even if they are mounted.

I was thinking it was a poor connection, but I have tried a different SATA cable and a different SATA port. Is it possible I have a faulty SSD, or is there something different you have to do with SSDs to make sure they stay mounted (I was thinking like it has some sort of goofy power savings feature that needs to be disabled).

• I found the place in the bios where the SATA ports are listed. They are all set to AHCI(Chipset - SATA Mode = AHCI)
• The unmounting/remounting happens all the time. I think this is the relevant part of the syslog: http://pastebin.com/WxHdRAAq