Ancient Cisco aironet 350 issue

Hey all!

I have an old HP tablet I'm repairing for a client. It is now squeeky clean and runs like a charm for it's age. My client uses it for facebook, email and a bit of surfing the net.

The problem is she has an old Cisco aironet 350 card for her wireless. It works great but once connected to the internet all other wireless computers and phones in the vicinity immediately loose their internet connection and start the connecting/aquiring IP/connected/disconnected loop over and over again. Once I disconnect the 350 all wireless devices connect just fine.

The card used in another computer doesn't cause this issue.

Setting a static IP isn't an answer as she will travel with this (and it doesn't make a difference anyway)

Buying a new card is a last resort to me as it does perform fine in another machine.

I'm baffled as the settings are identical in the device properties and for the ip protocols in both the machine it works in and the HP tablet.

Any brilliant ideas ladies and gentlemen? :-D