Samsung TV app "playback" error and won't delete shows

I have Tablo 2.2.18 and a Samung TV on wifi. I have nothing but problems on the Samsung. On my main TV that uses a Roku 3 connected through a swtich instead of wifi, it usually works (though the poor implementation on the Roku is another story). Whenever I try to watch a recorded show on the Samsung TV, the icon spins for a long time and then says “playback error”. If I delete a show, the different icon in the lower right spins for a very long time and then does nothing. No error and the show is still there in the list. If I go to the Roku and play a show, then it “fixes” the Samsung. So the act of going into the Tablo from another device, makes the Samsung app start working again. Any ideas?