Hello Bhirwinjr

                        G34 is a gateway, combination of modem and router so if the issue is on both the Wi-Fi and direct connection we need to check the cable signal level to isolate the issue and if the LED light on the modem is going OFF when you loose internet connectivity then you can try connecting modem to different power outlet or using different power cable. If still you find the same thing happening you can use Arris.com/consumersupport for further reference. To check the cable signal level of the modem you can use the steps mentioned on the link below 

                       http://arris.force.com/consumers/articles/General_FAQs/G34-G36-Cable-Signal-Levels

Thanks for the reply. In the mean time, I contacted Xfinity one last time for technical assistance. Later in the day a tech support person called me and indicated that they found an issue with a setting on their end that completely corrected the problem. They didn’t give me the setting, but mentioned latency? It’s been 5 days and everything is still great!

I am having the same issue and I cannot follow your trouble shooting instructions. I want to speak with customer support please. I work from home and this is a major issue. Not s service provider issue. My ISP is Xfinity. 

Sorry to say the problem is back.  I too believe it to be a modem equipment issue now also. I am constantly having to reset my modem to reconnect. 

The modem is the one that doesn't work. I've been using it for 3 months and there's no solution.  I recommend you buy another