I had zero problems with wifi until a house transfer. Tech came out had it working woke up next day and asking for activation again.
Now I cant shut off public wifi...I cant even connect to the xfinity wifi broadcasted through their modem/router and I keep getting asked to reactivate on certain web pages I go to. Not sure what to do at this point. Tech has been absolutely useless.
For the "asking for activation again" problem, try calling 1-800-comcast and ask a rep to completely remove the modem from your account and to "re-provision" it from scratch. Also ask them to confirm that the provisioning and account data in their database is correct and complete.