C3000 dropping connection

I have been having huge issues with this cable modem/router.  It kept dropping, connections and hanging.  After looking at the logs, I saw a bunch of DDos attacks.  My not yet confirmed theory is, there is an iOS bug out there because after monitoring for awhile, I noticed that the router "assigned" external ip addresses instead of the intenal, why netgears firmware would allow this is beyond me.  The issues occured when me or my daughters used our iphone on wifi.  After wiping iphones problems were still there, so my theory is that there are 2 things going on here, iOS bug and router firmare bug.

What I did was, I went and bought an Asus RT-AC1900P router (it has security features by trend micro), I disabled the router function on the c3000 and use it as just a modem and connected the asus and used it for wifi router.   After doing this, WOW, what a difference, before when streaming anything it would take awhile to load, now its almost instant!  I am currenlty usng sling tv on a trial basis, but was going to cancle because of the slowness, now with the asus, the menu loads in an instant and the live streams starts in seconds!!  Here is the kicker, I had my tv wired to the c3000 befroe and it was still slow! Not sure if this helps any , hopefully you tried the good ol reboot router and computer.    Not that it matters to me now but netgear should definately upgrade thier firmware for this modem/router.