@JakesPad 

You are not able to turn off QoS, but you can try setting it to Standard to see if that helps. Other recommendations would be to disable any device priorities that were configured, and also disabling the HomeCare features to see if speed still say below 100 Mbps. Even though the computer shows a link speed of 1 Gbps, try testing with other devices, and also swapping Ethernet cables.

@Tony 

I have QoS setting at standard.  I don't have any device priorities set.  No parental controls are set.  I've turned off the trend micro antivirus options.  I am still getting speeds of less than 100 Mbps through the router regardless of device, wired or wireless.  When I plug directly into the modem using the same cables I get ~ 900 Mbps.  

@JakesPad 

I would reach out to our support team to see if they may have a beta firmware to try or if the device may have malfunctioned.