I'm having the same issue with both of my Premiere XL4's wherby my TiVo's will respond normally to the TiVo button either using the remote or the iPhone/iPad app for a while and then all of a sudden the button seems to have no effect until I reboot. This issue is not related to my remote as this behavior occurs with both of my remotes as well as the iOS TiVo app and clears up after a reboot. Sometimes, I'll hear the ding when I press the TiVo button but no UI. FYI, I'm using the HD menus. I'm starting to wonder if this is related to the iOS app... Has anyone else had this experience?