I agree with Radenight,,, however I would add... you are using 7229, so any newer drivers might work fine in RTM and be broken in the older build.
Not saying that is the case, but it is possible.
Meaning, if driver updates are not working, wait till Oct 22 and get the official RTM, then see if the problem continues... if so,, continue trouble shooting with your PC Manufacturer on potential driver problems.
Also,, try a different SD Card.