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Additional 4 character Comcast e-mail login requirement

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Additional 4 character Comcast e-mail login requirement

I was just wondering about the appearance/disappearance/ re-appearance of the 4 character code required in addition to username and password to log into my Comcast e-mail application.  I undertsand the additional security the extra login step provides and support it's use.  I would just like to know why it was unstable in appearing, then disappearing and finally reappearing. Thank you.