Same happening to us and really need Arris or Xfinity to step up and resolve 

Hi

New here, has anyone found a solution? Same thing happening to my G34 purchased 2 months ago. Constant reboots daily

This is the latest firmware version. Is there a newer version? My provider is Xfinity.

Since you are experiencing with intermittent internet connection after updating the firmware version, I just want to make sure that you already checked the cable signals and also changing Wi-Fi channels.

If you haven’t tried yet, Find the steps in the below given link:

http://arris.force.com/consumers/articles/General_FAQs/G34-G36-Changing-the-Wi-Fi-Channel

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

Also I suggest you to reset the modem once and try to do Re provisioning  with ISP since the firmware is updated recently.

Xfinity came out yesterday. He changed out connections since they were no longer used.  appear shortly to work but then intermittent issues reappeared.  Just completed your recommendations and problems is still there.  I understood that Xfinity and Arris is suppose to be working on a solution, i.e. firmware update.  Nothing has worked so far. Is there a recall on G34/G36 devices?

Since you are experiencing with intermittent internet connection, I suggest you to change the Wi-Fi channels.

To change the same, Find the steps in the given link:

http://arris.force.com/consumers/articles/General_FAQs/G34-G36-Changing-the-Wi-Fi-Channel

Also you can Re provisioning the modem since the firmware is updated recently.