From Roku troubleshooting:
[[Roku XD 2050X Troubleshooting]]
'''Remote and Roku Need to Be Reset'''
Remove batteries from the remote. Hold down every single button on the remote for five seconds. Then, replace the batteries.
Next, unplug the power cord from the Roku, wait for five seconds, plug the power cord back into the Roku, and wait for Roku banner.
Ridiculous? Yes. Did it work? Also yes. :)