A new router might help, but it might not. It's tough to know exactly what's going on in your complex without being able to get more data on what the local RF e

A new router might help, but it might not. It's tough to know exactly what's going on in your complex without being able to get more data on what the local RF environment is like. Something must be interfering with your network, but that could be other wireless networks, or cordless landline phones, or microwave ovens, or the walls, or any number of other things. In terms of general tips, Jeremy1026's is good. Find the least-used channel in your area and switch to it. If you can find a block of three consecutive low-traffic channels, that's even better: pick the one in the middle. Again going back to Jeremy1026, 4 is often a good choice in the US, and you can also try 8 or 9 if 4 doesn't work out. But if you've got a lot of savvy people in your area looking for a good channel, you may need to look deeper. Many routers can perform something they usually call a "Wireless Site Survey" to help you find a relatively unused channel. At least in Linux, you can also use the iw family of commands, though there's a lot of output to sift through. I don't know what's out there for Windows in this regard, but there's got to be something.