In the last couple of weeks, I've had a weird issue with my SP3 (i5/8GB/256GB). I'll walk away from it and come back later to see the boot screen where you see the Surface logo against a black background and the spinning load icon. Problem is, it never boots. The only way to get any kind of response is to push and hold the power button for about 15 seconds, forcing a shutdown, then power up again. I don't know exactly what is causing this as it's always something that I find when I come back. That said, it sleeps most of the time I'm away from it that long and does just fine. But this weird reboot/lockup thing has happened about 4 times in the last couple of weeks. I have all the updates installed and everything seems to run just fine otherwise (although it does get a bit warm sometimes with basic tasks, but that's another issue in another thread). For the record, I've run the Microsoft troubleshooter and it finds errors every time I run it. Any thoughts on this? Has anyone else had this happen?