While watching Live TV, if I attempt to go to the previous channel by double clicking the play/pause button on the remote, the app enters a odd state. The switch to the previous channel does occur, and the video/audio is okay. But the timeline stays on the screen and then all input via the remote is ignored. After several remote clicks, the app restarts itself, successfully. If I attempt to change channels via the "quick guide" menu, everything works correctly.
Note: When I do this while using the Apple TV version of the app, it works correctly.
This happens on both the 2nd and 3rd generation fire TV hardware I have. I'm running the latest version of the DVR app (2.1.4). My 2 HDHR units are the dual legacy models.