All of a sudden I can no longer access Amazon Prime Video or Pandora in the Apps screen on TiVo. I have always been able to get both of these without any problems in the past. I have tried to get these apps using ethernet and wi-fi but no joy. When I select either of these services I all I get is a blank screen. If I select Netflix, although I am not a subscriber, I do get the signup screen. I am having no problem connecting to the TiVo service. Any ideas?