Boot Errors "A disk read error occurred" and "Invalid System Disk" - Then Still Works?

A little while back I bought some new hard drives to replace some older failing hard drives in my computer and because I do a lot of video editing work and needed higher performance drives. So I bought a Solid State Samsung 840 EVO for my main drive.

I've loaded Windows 7 Ultimate via a USB and for a few weeks it was fine. Now whenever I shut off and restart my computer i'm getting either disk read errors or invalid system disk errors.

The interesting thing is that generally I will get this error press CTRL - ALT - DELETE to restart my computer, and then the computer will boot normally with no problems? I'm not sure how stable it is though so i'm looking for some insight into why the system might still be booting properly after the initial errors, and a reset seems to 100% of the time (so far) fix this problem.

I'm just not sure what could be causing these "phantom errors" if the system boots properly and once i'm in windows works as intended. I'm actually on the computer right now, it's just something I figured I should look into considering I just spent about 250 on this Harddrive. The other alternative is that something is indeed wrong with the hard drive or install, and something isn't working properly.

HardDrive with Windows 7 Ultimate Samsung 840 EVO 500 gigs

Specs: GA-880GA-UD3H rev 3.1 32 Gigs of Corsair Vengeance Ram DDR3 AMD PHENOM II X4 965 NVIDIA Geforce GTX 570 850 Watt Power Supply

Thanks for the help.