Essentially, the behaviour here is that the Roku will ‘kick’ you back to the previous screen during a live or recorded broadcast. It is documented heavily here:
Our engineers were able to reproduce this and confirm it is a bug with the Roku video player. This has been documented on other Roku apps, including Netflix, among others.
It’s worth noting that a few users had ‘weak signal’ errors that could have lead to the Tablo rebooting. This caused some confusion - these were two very different issues. We believe Roku is still investigating this, and we’re hopeful we’ll see a fix in their next update.