XB8 Gateway 2.5GB port dropped from 2GB speed to 1GB speed overnight

The speed from the 2.5GB port on my new XB8 Gateway dropped from a measured ~1.8GB/s to ~800-900MB/s overnight.

The speeds from the other 1GB ports were around ~1.1GB/s and are now the same ~800-900/MB/s.

I'm on the 2GB plan.

I'm using a short (15ft) cat6 cable.

I've rebooted the gateway.

The gateway sees 2GB/s+ speeds.

Wifi speeds to iPhone are 1.5GB/s.

I'm suspecting an incorrect config file pushed out did this.

Anyone know how to fix this other than a technician coming out or swapping the XB8 gateway at the store?

Thanks!