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AFAIK the lockup occurs on server hardware, too. In my case, I used a PCMCIA UMTS card (Sierra wireless AirCard 875).
My overall impression is, that it might be related to the payload wireless devices put on the TCP/IP-stack. Typically, wireless devices stress TCP congestion handling far more than wired connections do. And yes, in my case the lockup may be provoked by a combination of CPU load plus a fair amount of open TCP/IP connections.