Many times when I have a problem, I do a google search and find out someone else has had that problem. I googled
your problem and found out this was on the forum in other years. See the google link below:
http://www.google.com/#bav=on.2,or.r_qf.&fp=53e3d0ede0d92e8a&q=actiontec+router+keeps+rebooting
One of those on the google page I put below, but I don't know if you can still use it.
http://consumerist.com/2008/01/04/fios-router-constantly-rebooting-heres-the-fix/
Hope this helps.
Holly
By the way I just looked at our router and it is the same one but has Rev.E at the end of the model number. We haven't had any problems with it so far and have had it for years.