C6300 Frequent disconnects

Netgear c6300 cable modem/router.

 I purchased it brand-new from Best Buy two months ago. Hook it up to Xfinity Comcast activated it, and life was good. Proximally two weeks ago started having a connection problem. Very peculiar set of problems when using my computer and the Wi-Fi function no ethernet, the router would display all green lights solid across the front of the panel,  however it would no longer cast my Wi-Fi networks and crash them.  This may be a very common problem in this particular forum but I can assure you even the Comcast cabling technicians were stupefied by this behavior. Furthermore the only way to retrieve the networks back was to reboot the router .  After several phone calls with X infinity support and Netgear customer support no headway in repairing this problem was accomplished.  I purchased another Netgear 6300  and went through the process to properly connect and activate it. Within one hour the router would display the same type of disconnection Wi-Fi station dropping behavior . I think it would be very unlikely to purchase two routers and have them both be duds. Which in my conclusion, leads to the fact that the router has problems either physically or  software /firmware related. To correct my problem I purchased a lesser cost Netgear router and with Standard setup and activation, it's performing flawlessly right out of the box. I personally don't want to router that requires expert router knowledge or customer support to install .

 If this problem is so widespread  Comcast needs to take this off their approval list or Netgear needs to figure out how to fix it. If my first router was still within the return date I would gladly return it.

 The whole process between Comcast and net gear concerning this router is a big negative.