Your XorgLog seems to show some bugs with the Nouveau driver that may
make the screen appear to freeze:
[ 11270.264] (WW) NOUVEAU(0): nouveau_dri2_flip_event_handler: Pageflip has
impossible msc 675984 < target_msc 675985
[ 12931.381] (WW) NOUVEAU(0): nouveau_dri2_flip_event_handler: Pageflip has
impossible msc 775617 < target_msc 775618
[ 13043.502] (WW) NOUVEAU(0): nouveau_dri2_flip_event_handler: Pageflip has
impossible msc 782342 < target_msc 782343
Can you please try installing the official Nvidia driver:
sudo apt install nvidia-driver-390
and tell us if that avoids the problem?
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1811731
Title:
compuer freeze
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