We're sorry to hear that you've been having this trouble with playing content on the Peacock TV channel and we would like to know how to identify and resolve any playback issues.
We recommend starting performing the below steps and see if you can resolve the issue:
Remove the channel from the Roku device
Power cycle the Roku device, by disconnecting it from the power cable and reconnecting the device back to the power
Re-add the channel back to the Roku device
One additional suggestion we would like for you to try by performing a system update. You can check for a manual system update by navigating to Home > Settings > System > System update > Check now. and see if you notice any difference.