Thanks for letting us know about the issue that you are experiencing.
As @atc98092 mentioned, we recommend that you first try removing the channels 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 then channels back onto your device.
Once you have added back the channels, login to the channel authenticating with your service provider. For more information on how to do this, you can visit out support page How do I find movies and TV shows available with my cable or satellite subscription?
Please keep us posted.