I have the exact same problem. I talked to Netflix and they said it is a firmware issue on Comcast. I talked to Comcast and they had my box reset and told me all of the firmware is up to date. Still having issues. Nothing got resolved after spending a lot of time on the phone. If anyone knows the fix to this, please reply. The Netflix sign in doesn't even remember my username each time. It is so annoying having to log in with username and password when you have to type each letter with the remote.
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