After almost two years of flawless connection to an eero v6 mesh network (wired ethernet connection, not wifi), my XPS 8960 started dropping the internet connection.  This happened both when wired and when I tried with WiFi alone.  The internet connection was robust and worked flawlessly with all my non-Dell products (Surface Pro 8; MacBook Air; Apple TVs; Google TVs; Google Nest doorbell; home security system; etc.).  I have Pro Service, so after two hours the Dell tech guy could not identify the issue and so ordered that a home service tech come to the house and replace the motherboard and wifi card. However, this did not solve the problem.  I wiped the computer again and sent it to Dell for service, and they could not recreate the problem and concluded it was not a hardware problem.  It seems pretty clear that there is a software problem related to the Killer Network Card that results in dropping the network connection.  The connection is reestablished when I re-boot but then quickly becomes unstable and disconnects.  I cannot believe I have a unique situation and would like to hear from others with this problem and if anyone has found a solution after the Dell support people have failed (as have the eero people).