Regarding the error code, all you need to do is update your driver. You can do this by downloading the most up to date driver from motorola
here.
Unfortunately, it seems like this might be two seperate issues.
Sometimes machines, especially laptops but it will happen to desktops as well, will shutdown when they are overheated in an attempt to prevent damage to the physical hardware. Judging by the "after about 15 minutes" comment, I think this might have something to do with it as that 15 minute window would give a non-functioning fan or unventilated laptop enough time to overheat your machine.
If the driver update does not stop the random rebooting and you do not think the machine is hot when it reboots, do this:
right-click My Computer and choose Properties; click the Advanced tab. In Vista, click the Start button, type System, Properties, Advanced, and press Enter. Click Continue if prompted by User Account Control.
In all versions, click the Settings button under 'Startup and Recovery'. Uncheck the Automatically restart box, and click OK twice. The next time the problem occurs, instead of rebooting you will likely see a text screen reporting a system error. Report back with what error it gives you.
Good luck!
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