I'm a new cord cutter and love the Tablo.
I have a setup to 2 HD TV's. The TV in the living room uses a Roku Express. The 2nd TV in the Bedroom uses a 2nd generation Amazon Firestick. I have Comcast/Infinity Internet (100mbps) into a Asus RT ac1200 Dual Band WiFi router. 2.4ghz measured speed is 35-40mbps. The Tablo is hardwired to the router.
Being new to this, I set the recording resolution to it's highest setting, HD1080 10mbps, 720@60fps.
And....it worked fine! Firmware 2.2.16
Then my roommate came home and started watching Sling TV on his Firestick and my recording playbacks went into a "Loading..Please Wait" frenzy. I checked it over a period of days, and it always worked fine when there was no internet/2.4ghz traffic. Every time the 2nd TV started streaming, the problem raised it's nasty head. So, I dropped the recording to 1080HD, 8mbps and it works fine with traffic. The programs I was watching were 1080i resolution channels, recorded @ 1080mbps. Does that still playback @ 720HD 60fps?
To me, the problem is something to do with router traffic. The measured speed of my router is 3-4 times more than 10mbps. The Amazon Firestick runs 470kbps constant with peak loads to 2mbps when loading a new stream. So, it seams the handshake on the Tablo to the Roku gets collisions with the traffic and creates a buffering/loading issue. That's my take so far. I will update this when I get more data.