I figured I would join in the discussion. I am not techie, so I apologize. I am running an imac 24-inch Mid 2007 on 10.7.3. Always do the updates and everything seems ok. I have been having problems with connecting, reconnecting after sleep and just losing my connection in the middle of being on wifi. I have replaced my wireless router, I have deleted all previous wifi networks. I have also renewed my dhcp license. Nothing helps. To reconnect, I have to continuously go to network preferences, assist me, diagnostics, then continue with the assist me and choose my network and it then reconnects. I have read some things about equipment plugged in and I have an ATT micro cell plugged into 1 ethernet jack in my wireless router/modem, I also have a bluetooth mouse, a printer plugged in USB and a Lacie HD using Time machine. Please help with any suggestions on stopping this annoying behavior. It is really frustrating and makes getting things done very time-consuming. HELP.
I lost days of productivity with the wifi issue that occurred the moment I upgraded to Moutain Lion - this SOLVED the issue for me after trying many that did not work and I am thrilled (follow in this order exactly):