Exactly the same problem!
I have the same problem with disappearing displays and high CPU usage after some time.
I seemed to have found a solution with the 191 Nvidia driver and the latest displaylink driver, but all of a sudden it stopped working and I'm back to random lockups with 90% cpu usage. Fortunately, there is no loss of work, but I do need to reboot to use the PC properly.
I was also getting bsod's but that stopped after I upgraded the nvidia driver. Any other tips or suggestions.
(I have a nvidia geforce 9100 graphics "card")
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