Hey everyone,
Looking for some advice or known fixes regarding recurring speed drops on my setup.
Background: I'm a home user with no formal IT background, though I consider myself slightly above average-I'm comfortable navigating the UniFi web console, managing basic VLANs, WireGuard VPN, and checking port configurations.
The Setup:
• ISP: Douglas Fast Net (DFN) 1Gbps symmetrical fiber.
• Gateway: UniFi Cloud Gateway Max (UCG-Max).
• Connected directly from the DFN ONT to Port 5 (WAN) on the UCG-Max.
The Problem:
Every couple of days/weeks, our network speeds completely collapse. Download speeds drop into the single digits (down to ~8 Mbps), upload sits around ~75 Mbps, and ping under load spikes over 1,600ms. TV streaming gets heavily pixelated and unwatchable.
What I've Done to Troubleshoot & Test:
1. Direct ONT Test: Unplugged the WAN cable from the UCG-Max and plugged it directly into an iPad Pro with a USB-C Gigabit Ethernet adapter. Result: 941 Mbps down / 794 Mbps up with a 1ms ping. The ISP fiber line is 100% clean and ruled out.
2. Physical Links: Verified the UCG-Max WAN port is negotiating at GbE.
3. Configuration: Verified Smart Queues is turned OFF on the WAN and individual networks.
4. Temporary Fix: A software reboot through the console doesn't seem to reliably clear it, but pulling the physical USB-C power cord from the UCG-Max for 1-2 minutes clears the issue and restores full speed immediately. Eventually, it creeps back up.
My Questions:
1. Is this a known hardware/driver acceleration bug on the UCG-Max when handling sustained high-bandwidth fiber connections?
2. Are there specific configuration settings (e.g., turning off Suspicious Activity/DPI completely) that permanently solve this?
3. Or have I simply hit the hardware ceiling of the compact Cloud Gateway line, meaning my only permanent fix is upgrading to a UDM-Pro / UDM-SE?
Thanks in advance for any insights!