I have TW cable for internet set in bridge mode and not acting as a DHCP server. This is directly connected to the WAN port of an airport extreme time capsule (1-2 years old). The time capsule has a connection to 16 port 10/100 netgear switch from one of its LAN ports. About 3 weeks ago I added 2 new airport expresses to extended the wifi range of my very large house. I ran hard lines to the airport expresses as well. Each express is set to bridge mode and just to extend the wifi network. The extreme time capsule is the DHCP server. Everything works fine as long as the expresses pair to the extreme over wifi, but doing this does not fix my range and speed issues on the far side of the house that the expresses are installed to cover. Problem: When the airport expresses are not hard wired I get a sub 5ms ping from a computer on the local network to the expresses and the extreme. Once I plug either one of them into the hard wired network my ping times to all devices are very erratic. Once in a while they are in the 1-10ms range but most often they are in the 1-2 second and time out range. Once I disconnect either one from the hard line the ping times return to normal within 5 seconds. Troubleshooting attempted so far: Again I connected either one of the expresses to hard line problem occurs. Disconnect it and connect the other same thing. Connect one of them directly to the airport extreme again same thing. Connect the express directly to a PC and ran ping test, sub 1ms response times and no change to the rest of devices. Connected ethernet to the WAN port of the expresses instead of the LAN port same issue. Repunched and re did the end of the cable used for one of them, same issue. Called Apple and was told this should work and provided no additional troubleshooting. Firmware on all devices were updated about 3 weeks ago after I got them stable over the wifi. Unfortunately I don't have the version written down, but they are all on the same version now. All devices have a green light on them when just using wifi to talk to the extreme. When hardwired in the airport utility the devices drop off the GUI and come back and are intermittently accessible. Whats left to test that i can think of: Replace the airport extreme time capsule. Replace the expresses. Wipe the network completely and start over from scratch with a full factory reset. Any help would be appreciated, I am dumbfounded as to why this is not working.