10.4 Clients Lose both Wireless Connection and Active Directory Binding

I work at a middle school with about 120 OS 10.4.2 iBooks. All are bound to our AD domain via the AD plugin. I have two problems that are happening to these machines.

First, they will drop their wireless network connection pretty often during the day. We don’t run any fancy wireless configuration, just a wep key and we turn off broadcasting.

Second, even when they have an active network connection, they seem to lose their binding to active directory. When I go into Directory Access, all the fields are greyed out, as if the machine is still bound, but the machine will only take logins if I unbind it and then re-bind it to the AD domain.

I saw that the 10.4.4 update is available in software update, does anyone know if there are AD fixes included in this one? Any ideas on what might be causing these problems? Thanks guys.