Router limiting wired and wireless download speeds

Today, Comcast techicians confirmed my Nighthawk R8500 router is limiting my download speeds to 29-30 Mbps. When they connected directly to the modem, they got 120 Mbps download speeds. They even tested the Ethernet cables between the modem and the router and determined they were working properly. I've had the router for a little over a year, but I only upgraded my Comcast internet service on December 4 (from 25 Mbps to 100 Mbps). The Comcast technicians checked the router configuration and said it was setup correctly. I installed the latest firmware, Version V1.0.2.106, last week. Any thoughts?
Model: R8500|Nighthawk X8 Tri-Band AC5300 WiFi Router
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Re: Router limiting wired and wireless download speeds

Have you tried telling the rouiter about your new speed?

Turn qos and traffic monitoring off that may help.

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