Somewhere, There is a Very Confused Mouse

Part of the frustration of being IT for my wife's PC is that no matter which laptop goes in her office, the Internet is deathly slow.  I thought Windows 7 was an issue because Windows 10 runs faster.  But that wasn't the real issue.  When we had the house built in 2005, I had 100Mb/s Ethernet run from my office to hers in the far end of the house.  I now believe that sometime in the last 10 years, some mouse under the house found himself saying,  "Wow!  That not only did not taste good, but left a buzz in my gums."  I moved the TP_LINK unit from the garage to her office, and suddenly, Ethernet is working great!