Thanks for the details here.
Please send me a PM with your Roku account email address, the serial number(s) of your Roku devices, and any additional information or observation that may help investigate further. We'll go ahead and help pass along your report to the channel provider to take a closer look from there.
(To also note, it appears as if Sling TV may have altered the availability of one or more of the channels you mentioned within their service: https://help.sling.com/en/support/solut ... -channels-
Roku Community Manager