Gave WhoCrashed a try...interesting results. It is pointing to the Keyspan USB-Serial adaptors. I am using two since I got the G11, having used one for four years without an issue. Checking in Google it looks like others have had issues with this adaptor under certain circumstances.
https://www.google.com/search?q=usa1...0&bih=600&bs=1
Conclusion
</B>
8 crash dumps have been found and analyzed. 2 third party drivers have been identified to be causing system crashes on your computer. It is strongly suggested that you check for updates for these drivers on their company websites. Click on the links below to search with Google for updates for these drivers:
usa19h2k.sys (USB driver for the Keyspan USB Serial Adapter, Keyspan)
usa19h2kp.sys (Keyspan USB Serial Adapter - Serial Driver, Keyspan)
If no updates for these drivers are available, try searching with Google on the names of these drivers in combination the errors that have been reported for these drivers and include the brand and model name of your computer as well in the query. This often yields interesting results from discussions from users who have been experiencing similar problems.