I think my PCI Express SSD is failing. I have a OCZ Storage Solutions RevoDrive 3 Series 480GB PCI-Express SSD as my primary hard drive and two 2TB Seagate Desktop HDD ST2000DM001 2TB. Recently I have been getting errors where it says there is no hard drive connected. This error only happens when my computers is left on and idle for more than an hour. I have not had this error on startup or while using the computer. I have checked the connection and it is secure. The SSD is over 6 years old. Is this a sign of a hard drive failure?