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HP z840 reboots randomly

HP Recommended
HP z840
Microsoft Windows 10 (64-bit)

HP z840 bios 2.26 reboots after some time the time seems random. I thought it might be CPU temp I replaced thermal compound with 25% silver type no change problem persists. I ran hwinfo64 and watched temp sensors. It would be helpfull to know what are the maximum temperature before reboot. I thought it might be windows related however on a few occasions the workstation rebooted during being in bios config menus. The strange thing is if I run a memory diagnostic test the workstation seems not to reboot at all. Any one have any ideas? Diagnostic procedures? Should I update bios? Perhaps try the offline diagnostic iso? Thanks for your time in advance.

HP z840 2 x e5-2650v3
Micron 4x 16gb PC4-2133P DDR4 ECC
1tb SSD, 240gb SSD, 2 x 2tb sata
Windows 10 64bit, ParrotOS (Linux 64bit)
Level 11
4,680 4,654 440 987
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look at the windows log files (not the files it creates when it blue screens which are DMP files) but the log files it creates as it boots and is running this can be viewed by looking at them from "event viewer" check the application and system log files

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