cm1200 drops cox service and freezes

I have cox internet service.  I have had issues almost every day during the week of the modem locking up and dropping signal.  My Night hawk router loses internet even though the modem indicates I have signal.  I go through cox and reset the signal to the modem, which it does, but then I still don't have internet to my router. I have to get on with the cox support team and they have to send a massive reload package to the modem, it resets, and it finally works again.  It's about 30 minutes a day on customer service that I am spending with down internet and having them send a big enough reset signal to unlock the router.  What is going on?  I even went as far as to factory reset the modem.  This lasted for about a week and then I started having the same issues.  It happens at least 2-3 days a week now.  I reset the router (night hawk as well) and modem each time.  

Any ideas?