I did restart the system/device, and yes, I restarted my modem and my mesh. Since I'm getting a replacement stick, I'll hold off on trying to remove and re-add channels after restarting the device. I'm guessing by "channels" you specifically mean the DirecTV streaming app and you're calling that a channel? If you're referring to the channels within the app, then it is affecting many of them, not just a single channel.
Once I get the new stick, we'll see if it starts happening again and maybe there's something beyond what I've already done that we can try. I really hope that it just works with the new stick as I'd like to stick with the Roku stick since it has the most memory and definitely provides a smooth and high quality experience when it's not glitching.