I was watching a somewhat interesting television show on my Apple TV with the Tablo app where I suddenly got a black screen with a ball and then the message you have been disconnected from your Tablo.
This is probably the Tablo resetting itself, quite possibly due to a low/corrupted over the air (OTA) TV signal. I experienced this while recording a TV show from a channel with a poor signal. The recordings were during the evening (when I’d be otherwise watching something else via the Tablo) and the poor signal would be enough to cause the Tablo to reset and become unavailable for 2-3 minutes while the Tablo restarted.
the program jumping back a half hour and not wanting to go forward.
This is a known issue while watching live TV on a Tablo through an Apple TV. See the thread “UNpausing causes jump back to previous show”.