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Well I live in an Xfinity area that has not yet flipped the switch on the upcoming docsis 4 integration (it's coming) and my g34 is behaving much like everyone else's. Yes I have the new firmware and yes the issue persists. And it's a weird one. The 5g wifi vanishes. The wired connection also drops. Simultaneously. The most frustrating part is the blue indicator light does not indicate a network interruptionĀ 

In this case have you tried the basic trouble shooting for intermittent connection issue where you need to change the wifi channels and monitor connection for 24hrs please follow the steps mentioned on the article below to change the wifi channel

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