Looks like all those kernel errors / nvidia / pcieport ones might be something, but i have no idea…Maybe @Stephane and others will!
Jul 28 15:15:03 firstecho kernel: i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
This looks like some Intel GPU stuff, try change to UXA as adviced here https://bbs.archlinux.org/viewtopic.php?pid=1533863#p1533863
On ACPI errors, read this:
Doubt it’s reason of such crashes, and this is matter of experimentation for your machine on what parameters are appropriate, but worth to know…