Hi @Golfnut92 

Welcome to the Sonos Community! And, apologies for the delay.

Although grouping for TV audio generally works, it’s unsupported as we are aware that it heavily depends on network health and available bandwidth. When a Home Theatre device plays to a Sub or Surrounds, dedicated, low-latency 5GHz WiFi links are used so the satellite speakers can stay in-sync with the HT device, and it can in turn stay in sync with the picture. When playing to other rooms, however, the normal network must be used and this can cause the interruptions you describe as the HT device doesn’t normally try to buffer as much of the audio, as would happen with music sources, in order to attempt to stay in sync. This buffer can be adjusted with the Group Audio Delay setting: please open the Sonos app and go to Settings icon » iroom with Beam] » Group Audio Delay, then choose an option with a higher delay than is currently selected. This will make the Beam and Roam further out-of-sync however - if you cannot hear both at the same time, this won’t be much of an issue, but if you can, it will likely sound like an echo or reverberation. 

You’ll find someone with a similar situation who I spoke more about this to here:

I hope this helps.