In this case, it sounds like TRUE buffering vs. the stutter that we were seeing.
Can you try reducing the Live TV quality in your Tablo’s settings momentarily and see if there’s an improvement? If so, then there must be a bottleneck in your home network.
If not, try one more thing… Disconnect your hard drive from the Tablo and then try to play a Live TV stream. If there’s no buffering it could be an issue with your drive.
There’s some additional reading here on buffering issues, causes, and solutions: