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Error code: XRE-00021 are caused by signal issues.
When this error occurs, you will see the following message:
- There was a problem tuning to this channel. Please tune to another channel.
- To resolve this issue, you may need to restart your set-top box.
How to Reboot Your X1 Set-top Box
For additional information on error XRE-0021 review this related community post: Xre-00021 error