braves vision glitches constantly

We have an XG1v3 settop box with pristine RF levels, 44 dB SNR, and yet channel 1254 is constantly glitching.  Audio cuts out, video freezes, often both at the same time.  Tiling as well.  The difference between this channel and all the other linear channels in the guide is that Braves Vision is delivered via 8 Mbps IP video stream over the embedded DOCSIS modem inside the STB.  But I've got a good drop, so is it just that this old STB can't keep up with this stream?  Yes, I've rebooted.  And it's the only box I have so there's nothing to compare it to.  And I don't have Xfinity internet, so the Xfinity Stream app is basically dead to me.  Any thoughts?