Dell Studio 1558 freezes when connected to public (University) wifi network

I've had this laptop for over 4 years and this is the first time something like this happens. Whenever I connect it to the university wifi the laptop freezes. Already tried updating drivers and using it without the anti virus. This only happens when I'm at uni. On every other wifi network the laptop works just fine. 

I really need some help to work this out.


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