Code:
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* Bugcheck Analysis *
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Use !analyze -v to get detailed debugging information.
BugCheck EF, {ffffe000da8bd7c0, 0, 0, 0}
----- ETW minidump data unavailable-----
Probably caused by : csrss.exe
Followup: MachineOwner
the above bugcheck means a critical process died which could well be down to your drivers. Which drivers did you update as the dates seem the same as the earlier dump files.
You also had a bugcheck 9F which means a driver reached an invalid power state.
Try running memtest86 anyway
Also pop into the advanced power settings and make sure hybrid sleep is enabled if your using it.
Regarding heat, it's always best to keep your machine as dust free as possible. Whether the bsod was heat related or not it's always worth chasing those dust bunnies away.