Latitude D505 & Cisco 802.11a/b/g

We have a couple of Latitude D505s with Cisco 802.11a/b/g cards that are locking up/freezing up while connected

to our wireless network.  The access points are Cisco 1100.

 

Anyone else experience anything similar to this?

 

Cisco has had me try numerous things to solve this but nothing has and now they suggest it may be a Dell problem.

 

Any suggestions?