WMC on Win7 (not sure about other versions of Windows) using a HDHomerun Prime (perhaps other tuners?) has a bug called the "47 hour DRM bug".
This bug can cause recordings of DRM channels to loose video every 47 hours (any DRM channel that is recording when this 47 hour timer expires will stop recording video).
This timer is "reset" when any of the following events occur:
- The WMC machine is rebooted
- The HDHomerun Prime is rebooted (may have to reboot them all if you have more than one, not sure)
- The WMC machine is put to sleep and re-awoken
- 47 hours has expired, triggering the bug and resetting the timer
If you are not recording any DRM channels during this period, then you can ignore this warning. However if you are, then you may want to keep an eye out for this issue, and maybe put the WMC machine to sleep/wakeup or reboot the Prime at least once a day to avoid the problem. NBC is not making this easy, since there is pretty much 24/7 Olympics programming for the entire 2-week period.
There is a longer explanation of this bug and a link to a thread that discusses it further here:
http://www.thegreenbutton.tv/forums/vie ... 34#p105234
That thread links to a thread with a script that will automatically reboot the Prime for you to avoid this bug, but it will only do it if WMC is not recording, so it will not work in this situation (since WMC will always be recording the Olympics).