Recorded Shows Won’t Play-Black Screen

I have a Roamio Pro on Verzion FIOS. A few weeks ago, my recorded shows from HBO stopped playing. When I select the show, I see a black screen and the player controls, but cannot play or fast forward. I have to restart my TiVO for the recorded show to play, and this only works once. The next time I try to play an HBO show, the same thing happens. I can’t figure out what this is. I thought it might be a DRM issue, but then other content might have this problem. I am concerned this could be come widespread. I did not change anything about my setup recently, so this is very annoying and confusing. Please help.

 

Yes, I am running 21.9.7.v8-848-6-848

 

TiVO disabled pre-roll ads. I thought by forcing a network connection, this was fixed. However, it's still a problem. Why would it only occur on HBO and no other channel? What can be done to fix it?