Last used device was not found

Whenever I try to start Tablo I get the message “Last used device was not found”. Then below the picture of the Tablo there are 2 buttons: one says “Tablo Dual” the other says “Search Again” I have to continually click these buttons for 20 to 30 minutes before the Tablo Dual changes to Tablo and I am able to start. Many times by the time it starts the program I wanted to watch is nearly over. I love Tablo when it works but too often it does not work. Had I known all this aggravation was to come with it I probably would have stayed with Direct TV

What playback device? Roku? Nexus Player?

Reboot your router, wait 2 min, reboot your Tablo, wait 2 min, then reboot the playback device.