Thanks for sharing this concern with us, @bananamaniac.
We apologize for the inconvenience this has caused.
May we know what troubleshooting steps you have taken so far to resolve this concern? Also, since the issue has been happening with a couple of channels, the network connected to the device could be a possible cause. With that, we recommend that you try rebooting your router or connecting the affected device(s) to an alternative network, such as a mobile hotspot, and observe for a difference.
Please let us know what you find out so we can continue assisting.
Sincerely,
Janadee
Nadee K.
Roku Community Moderator