Frequent Comcast Xfinity Internet Disconnections – XB10 Gateway in Bridge Mode

I'm experiencing frequent Internet disconnections on my Comcast Xfinity connection, with multiple outages occurring throughout the day.

My setup:

• Comcast Xfinity XB10 gateway operating in bridge mode

• UniFi UXG-Fiber router connected directly to the XB10 over 10GbE

• WAN1 connected to port 5 on the UXG-Fiber

My UniFi router has been reporting repeated "Internet Down," "Internet Restored," and "Multiple Internet Disconnections" notifications.

Recent disconnections (October 30):

• 8:34 PM – Multiple Internet Disconnections

• 8:35 PM – Temporary Internet Disconnection

• 8:37 PM – Internet Down

• 8:40 PM – Internet Restored

• 8:41 PM – Temporary Internet Disconnection

• 8:51 PM – Temporary Internet Disconnection

These are just a few examples. The problem has been recurring throughout the day.

Troubleshooting performed:

I SSH'd into my UniFi router and ran independent connectivity tests against Cloudflare (1.1.1.1), Google (8.8.8.8), and DNS resolution.

During a roughly 26-minute monitoring period, I recorded:

• Cloudflare ICMP: approximately 32% of checks failed

• Google ICMP: approximately 26% of checks failed

• DNS resolution: approximately 27% of checks failed

The most significant degradation occurred between approximately 3:27 PM and 3:43 PM Pacific, when connectivity to multiple independent Internet destinations repeatedly failed.

The router's 10GbE WAN interface reports a negotiated 10Gbps full-duplex connection, and earlier checks showed no interface errors or dropped packets.

I also verified that the Comcast next-hop gateway was reachable through ARP.

Since direct IP connectivity and DNS resolution both experienced failures, this does not appear to be simply a DNS configuration problem.

Could someone from Comcast help here, specifically:

1. Check the XB10's DOCSIS signal levels, upstream/downstream errors, and connection stability.

2. Review modem event logs for T3/T4 timeouts, ranging failures, or intermittent synchronization problems.

3. Check for upstream network issues, signal impairment, or instability affecting my connection.

4. Determine whether the XB10 itself could be contributing to these repeated disconnections.

I have timestamped connectivity monitoring logs and UniFi WAN event logs available if needed.

The frequency of these interruptions is making the connection unreliable. I'd appreciate assistance investigating the underlying cause rather than simply restarting the gateway, as the problem is intermittent and recurring.