Some remote control functions not working

Xfinity advised by phone that the remote control had to be "paired" with the system.  In doing so, the light on the remote turned from red to green. The "guide" menu and other functions work now.  I neglected to ask why, or how, the remote control became un-paired from the system.

Thanks for your response.  Before my post, I disconnected and reconnected the cable box, and refreshed the system on the xfinity website.  Is there anything else I should try?

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@Arnie55 wrote:

Thanks for your response.  Before my post, I disconnected and reconnected the cable box, and refreshed the system on the xfinity website.  Is there anything else I should try?

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when you press guide what color(s) flash on the remote's LED?