I have been using an ERL/Unifi setup for about 6 months with minimal issues until recently. I pay for 1000 Mbps from my ISP but I've only been able to get around 80 Mbps on the fast.com speed test. I started investigating and noticed that the orange light is on for eth0, which is WAN in my configuration. I unplugged the cable from the ERL and plugged it directly into my computer. My speed improved to 820 Mbps on the first test, so it appears obvious that the ERL is causing the slow down.
The only relevant setting I have been able to find is speed/duplex for eth0, which is set to auto negotiation. None of the other settings make a difference, and there isn't one for 1000 anyway. The only related posts I've seen reference changing out the cable, but this cable is built into the house and not easy to change. Plus, the speed result on my computer would seem to rule out an issue with the cable.
I welcome any suggestions about what I can change to resolve this issue or definitively determine if this is a hardware failure.