......Hi
See a bunch of people missing the in GUI Reboot feature which Comcast took away with the last Update....Why? Because they can. Plus they are prob. tired about people keep resetting it or changing the MAC of the Router to get a different IP....XD
Well I never used that Button but I noticed that some people here are really upset about this.....so let me teach youhow I do it....
Go into your fav. Browser... Instead of bashing in your regular Local Modem IP what is http://192.168.100.1/ for people who don't know. Do this:
http://192.168.100.1/reset.htm
(This will reset your Modem and even give you the Screen that you successful rebootet your Modem all by yourself)
If you wanna reset your values back to default what incl. wipe of the Log do the following:
They don't let me post the code for the reset to default here....
so see the Picture below. 
After this one you should do the reset, that was this one in case you forgot
http://192.168.100.1/reset.htm
Soo TATA all your missing features at your fingertips again....you little Hacker you...hope that helps
J0mant