Xbox one Networking issues

[ProxGT]

For the last few months i have been having an ongoing issue with the two xbox one's in my house. I have tried everything short of buying a new router to try to solve this issue. What happens is that when i have both xboxs hardwired to the same router one always drops connection, it ussually only last about 5 seconds, just enough to kick you out of a multiplayer game and make you resign in. We tried to run one xbox wifi and one hard wired and that does resolve the disconnect issue but then one xbox has to run wifi and its laggy when playing online. We have tried new ethernet cords and that did nothing. I am assuming the router we have just doesnt have the bandwidth to keep both xboxs online at the same time. I am no genius when it comes to networking and really need some help. Thank you!!