Random shutdowns either entering or exiting sleep. No BSOD, the dump reports usbhub.sys as offensive (got the dump if needed). The first time found the machine non-responding while waking up (yesterday), today shut down while entering sleep. We had major power issues here in Boulder, CO due to a snowstorm a few days ago, but the machine is hooked up to a UPS (CyberPower). No symptoms aside from what I described. The only energy-consuming device connected through USB is my Brother laser printer, which is powered directly by wall socket. Disconnected it now, will report.
Unfortunately, perfmon crashes on this Dell model (a lot of complaints online), so I can't supply that. jcgriff2 stuff attached.
OS: Win 7 Home x64 (original OEM by Dell, no reinstallations)
Age: less than a year
CPU: Core i5-3450 @ 3.1 GHz
Video card: NVIDIA GeForce GTX 660 by Gigabyte
Motherboard: Dell
Power Supply: Dell, 460W (or so Dell claims)
Manufacturer and Model: Dell XPS 8500
Thanks in advance.