I have a network with about 500 clients on it, all on one domain. Lately, mostly wireless laptops (on a cart -- 25 laptops to one access point mounted on the cart) have been having issues with logging on to the network. 10 or 15 laptops will access fine, but 4 or 5 will get the message -- "domain not available" when the students try to log on. I have five of these carts and they all seem to be doing it and this was not much of an issue several months ago. The laptops are Lenovo machines running windows XP pro with celeron processors and 512mb of RAM. It appears to be random and sometimes a laptop restart helps and sometimes it does not. Sometimes all laptops will work fine and connect. Any thoughts on what to check here since some can get on and some cannot. This rarely happens with "wired" desktop machines. Any help is appreciated. Thanks!