Hello, I have been losing 10-20 mb's download speed on my Archer c-4000. I have reset it many times for it to only go back and lose 10-20 mb's download speed again. I have tried a different ethernet cord still same results. If  I hook directly to modem, I have full speed at 55 mb's download and 5 upload. It says I am up to date on firmware version. I have tried reading through other problems on here for fixes but my menu is different than what I find.