My small apartment building with 6 tenants has a centrally located cable modem and N router with 100Mbps down and 3Mbps up. We used to have 20Mbps down and 2 up and my wife and I had no problems watching netflix and streaming music or games. Out of nowhere, the speed dropped to 5 Mbps max and 2Mbps average with 500ms ping and 30% packet loss. It's slow enough that my PS3 cannot connect to the network, desktop and laptop (PC & Mac respectively, both with N) cannot hold a connection for more than about 15 minutes. It's virtually unusable. Even the tenant who is right next to the router is having the same issues. Strangely enough, my Wii U can stream Netflix pretty regularly.
I have run iperf, but haven't been able to see anything out of the ordinary - although I'm not sure what I'm looking for. Any diagnostic thoughts? I'm going to try getting to the router to set up a wired connection this weekend.
More about :wireless network problem 500ms ping packet loss theoretical speed