The 890 error message has been reported to our Engineering Team, and they are currently working on a permanent resolution. Once a resolution has been found, they will release the fix in a nightly update. In the meantime, we have found that the workaround of pressing the channel up and then back down or a HDMI reset has resolved the issue.
If you would like to add your account to the report for our Engineering Team, please feel free to reach out to us via private message on Facebook or direct message via Twitter or through our Chat team, and we would be more than happy to do so. The more account examples that we are able to provide to our Team will help them to isolate the issue for a resolution.