Ok. just wanted to add another data point to this issue:
I have a PLEX media server on my network. Last night, I installed the Tablo channel in PLEX and watched live tv via the PLEX web interface and Tablo channel; absolutely no problems at all for hours.. well, until I passed out. lol
So, I thought, if this is a communication issue between Roku4 and Tablo, what if I were to watch content via my PLEX server? This morning I used Roku4 PLEX app to watch the Tablo channel on my PLEX server for a TV show recording I had; the issue still exists, but manifests in a different way, probably due to the PLEX server being in between. Basically, instead of getting the "Loading ... Please Wait" message, the video/audio stream freezes for a few seconds, and then continues playing. In summary:
Roku4[Tablo channel]->Tablo = results in LPW issue
Computer[web interface]->PLEX server[Tablo channel]->Tablo = no issues at all
Roku4[PLEX channel]->PLEX server[my own library] = no issues at all
Roku4[PLEX channel]->PLEX server[Tablo channel]->Tablo = results in frequent freezes like LPW issue
Even when the Tablo and Roku4 do not communicate directly, there appears to be a problem.