This video will show you two ways to reset your comcast xfinity cable box specifically the x1 cable box. It might be that there is a signal disruption or something that has to do with the signal.

Restart Your Xfinity X1 Cable Box Xfinity
Why does my comcast box blink. That means that it has lost connection to the comcast system and is trying to reestablish it. For the best answers search on this site httpsshorturlimavwcm. Hello try unplugging it for 5 min then plug back in if still doing the same thing call comcast ask them too reset your box good. Xfinity for full functionality of this site it is necessary to enable javascript. Comcast box flashes power light then turns off. And the message light blinking yellow.
Xfinity for full functionality of this site it is necessary to enable javascript. If its the smaller x1 box roughly the size of an iphone then it means its trying to reconnect to your main x1 box. Why is my comcast cable box power light blinking. Learn what the led lights on your x1 tv box indicate about your device status. Learn about replacing your equipment now to get the most out of your xfinity service. You can try to turn off the box and unplug it.
I was updating my firmware on my samsung lcd and it lost power be4 the update finished. Now it wont power up only the red led is on with no blinking.