Failure to download a single day has been posted before. Will it fix itself? Maybe, maybe not. You can go to 243 zones and do a net connect. If you see a connection is established and the download completes and you still don't have the missing day I'd delete the guide (243 zones) and do a net connect again.
A previous post has warned that deleting the guide at a time when you are not able to successfully perform a net connect results in no guide data at all, which is worse than missing 1 day. I've been fortunate having no problems connecting with replay.
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