There are two N900s in this household and both have the same problem. Both are on PR1.2 and connecting to the same access point which is a ZyXel G1000 V2 which I have updated to the latest firmware.

Basically they will connect to the wireless when they see it which is fine, but after a few minutes or so of no network connection they appear to disconnect from the WLAN, but the device still believes that it is sucessfully connected.

The upshot of all this is that when one of us actually bothers to do something on the n900 while in the house, it wont work. eg. the app manager will complain that all the repositories are down. To solve this we have to disconnect and reconnect to the WLAN manually.

I do have power management turned on, but surely if that is going to drop the connection to save power then it should know to bring it back up.

When this happens, ifconfig also believes that the WLAN is still up. It reports no errors or dropped packets and even counts the results of my failed ping attempts as sucessfully transmitted packets, though there are no more received packets, obviously.

I've got exactly the same problem from the start! its connected to a Linksys wrt54g if the connection is idle for some time it doesnt work anymore... reconnecting resolves this

With power save on, your router/AP will not get any traffic that tells it that the N900 is still connected. This is a "feature" in the router/AP that, as far as I know, is pretty common. In my case, the DHCP lease is still active but the AP won't handle any packets if I want to use the connection again.

So, not a problem with the N900, really, but a side effect of common handling of wireless connections.

my n800 had this problem, my n810 and now my n900. must be a feature.