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Modem (Wireless Speed Drop) Help Ideas?

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To get all up to speed I have Xfinity Blast Pro ( Supposedly 150 Mbps/12 Mbps)

Using the Cisco DPC 3941 Wireless gateway.

When I look at my personal connection Data I see I am getting 300 Mbps

but what I have found is after say a few days my speed drops (via online testing) down to 

20-30 Mbps even though my connection speed to the gateway remains at 300 Mbps.

this leads me to believe that the Gateway is having issues on the download side.

I forgot to mention my upload speed stays really consistent between 11.5 and 12.5 Mbps.

Any Ideas what causes this? as soon as I do a Complete Gateway Reset it goes back to close to full speed but in like 2 days I am back to Slug Speed.

Wifi Status 9-15-16.JPG

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