At home, we have our VDSL modem in bridge mode, into a (recently new) TP Link TL-WR841ND Wireless Router.
This then feeds another identical router in my room for closer wifi coverage, DHCP off, router ip different.
I did have different routers but because of this problem ended up replacing both to try fix it. My laptop is connected via wifi to the second router and often maxs out the lan connection to the home server.
Okay so if I am downloading eg. a continuous steam of torrents with decent download speed (3Mbps ish) then after some time, could be 10 mins, could be half an hour or up to an hour max, then my laptop will just die network wise (windows 8.1), the wifi icon will have the warning icon and I can't do anything. Or if I'm, eg large file transfers to the server or trying to backup my laptop the the backup drive on the server, and hour into the initial backup and almost done, network dies.
But it also takes out a lot with it. If I move closer to the other wifi, connect, I can't access my dreambox which is connected to the second router, or the home server. And trying to reconnect to the second wifi cannot get an ip. (isn't talking to the first router at all) and a simple restart of both routers doesn't fix it straight away. Sometimes requires multiple restarts.
They are connected via a cat5e cable solid core cable under the house, but if I remember rightly the problem was there 6months ago at our old house with a different cable between them.
I have run out of ideas :( Is there anyone thats experienced this or just knows whats wrong.
Hope this makes sense