Thanks for the inquiry.
Can you please clarify the issue you are experiencing? Are the channels that you are experiencing Live TV (antenna) channels or are they normal channels on the Roku Home Screen? Can you provide us with the channels that you are experiencing the issues with?
Try removing the channel(s) from the Roku home screen by navigating to the channel tile, pressing the * key on your remote and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more. Does this clear up the issue you are seeing?
With more information we will be able to assist you further.
Roku Community Moderator