After the second week of usage I must confirm that my N900 (and from the posts I've read some other too) will occasionally have an issue with the wifi connection. It looks like the Wifi module/service hangs and will not find any Wifi spot until it gets reboot. And I would guess the wifi hangs in an "always on" condition as this will casue the battery to drain VERY quickly (4.5 hours with a full battery).

I haven't been able to reproduce the issue, it seems to happen randomly... When I see the battery drain too fast, I check wifi connection and see it does not pick up my wifi router (nor the others that are in the area), If I reboot everything returns normal, and fsat battery drain stops.

Is there a way to check wifi service/module status through xterm commands?

I will try posting this also on Nokia Support Discussions.