I'm getting a very strange issue. I can work on my computer for many hours without any issues. But, if I step away for 20 minutes and come back, it's completely frozen and I have to hard reboot. To see if this is a problem with the sleep or hybrrid sleep functions, I disabled them all. Everything is set to NEVER shut off. But the freezing still happens if I walk away. Otherwise, no freezes.

So, what could be causing this freeze? Any idea?