Matt i feel your pain. Ive had this issue since day one :-(

Ive followed this site religiously, but never had much to say so ive only registered now.

As Matt has pointed out, the Wifi works flawlessly so long as you stay within range. The second the phone loses its connection with the router (eg: i leave my house to go to varsity) when i return home, and the N9 is back within range of the network, it refuses to connect again.

The Wlan is seen, but on attempting to reconnect i get the error "there is something wrong with the network connection"

the only solution is to restart the router.

Ive tried every possible combination of settings on my router. to no avail. This issue is crippling for me. from where im from (South Africa) 3G data-costs are terribly expensive and my devices live on Wifi connections. With this wifi problem, my N9 was unusable.

ive sadly moved onto a Galaxy Nexus purely because of it. :-(

i still love my N9 and every day i Google this issue with bated breath in hopes for a fix. The day i find a solution for this, my Nexus will become a paperweight

Ps: i have tried the WPS button thingy mentioned above, but still, the problem persists...oh, and sorry for the long post

PPS: this is definitely not a hardware issue. ive tried reproducing this bug in Nitdroid and it just isnt an issue. The wifi in nitdroid works 100%. so this is certainly something to do with Harmattan