Today, the HD LF had problems of its own again. At 2:38 PM CT, the LF started with music playing, but the LF failed to appear, resulting in a few seconds of a blank screen until they switched to the emergency feed.
Then at 2:48 CT, the exact opposite problem happened: the LF appeared just fine, but the audio was nothing but static. The emergency feed finally kicked in once they realized the audio problem. By 2:58 CT, everything was back to normal.