My first week using my G34 was a nightmare.  Here’s a quick summary of everything we dealt with.

Ethernet ports would suddenly go dark on the modem and the wired devices would lose connectivity.  Rebooting the modem was the only “fix”.

Wi-Fi would constantly disconnect, show as unavailable, or drop connections.  

Fix for ethernet ports going dark and disabling all ports?  I changed the ethernet ports on the modem from 1000MB to 100MB.  Why?  My Roku device was using a port that has a limit of 100MB.  Making this change resolved all the issues.

For the Wi-Fi issues, the fix was to move the channels to a lesser used one as my neighborhood is saturated with everyone elses signal.

These changes are all done in the app or via the web console:  192.168.0.1 from your home network.

Hope this info helps!