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HI there I had teh same problem years ago
I foud the solution here in tis forum by a person called michlever in 2017
this is his avice and it worked immediately. For somereason windows 10 puts energy efficinecy onto the archer 1600 to the point that the internat slows down to a crawl. Did not happen on my wondows 7 laptop connected at exactly the same time.
I recommend the tpg gurus store this one somewher in your set of standard anseers instead of it getting lost into the archives. Peopel can spend days trying to solve the problem and somethines even get a new modem when the probelm is awindows 10 setting that it easily chnaged.
see steps belwo
Julie
I found the solution in changing the adapter properties to disable Energy-Efficient Ethernet
Never had the problem after this.