This is probably due to the open source 'nouveau' driver the system is
using. Please open the 'Additional Drivers' app and use it to install
the Nvidia driver it recommends.
If the problem continues to happen after that then next time the freeze
occurs:
1. Wait for 10 seconds.
2. Reboot.
The same thing happens when I lock my screen. When I come back, the
power has shut off. Pressing the power button starts what looks like a
power-up, but it ends up with just a black screen. None of the keys seem
to do anything. I have to power-cycle my laptop to get it to work again.
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