I have 2 HDHomerun Prime boxes with cablecards. Last night just before 7pm all my channels went dark. I initially thought it was my PC but finally realized this was affecting all devices and software in the house. The system log in the primes shows the cablecard tuning to a channel, initially getting a subcribed message, but then 5 seconds later gets a not-subscribed response.
Both cablecards show validated and good signal.
Here is an example message session from the Homerun logs: