SSD Write Performance Issue.

[.Apex.]

System:

CPU: i7 8700k

MB: ASUS Z370-A (Currently BIOS 0809)

SSD: Samsung 860 EVO 500GB 2.5"

Windows 10 Pro 1803      Build: 17134.137

 

i've been having this issue for a while now, my memory is not that great so i can't really tell you the specific date, but it started in June.

 

so i bought my SSD on 20/06 and i've had BIOS 0616 on my motherboard, benchmarked the drive thoroughly with lots of software to make sure everything is to spec, and it was working perfectly, even a little above spec.

 

but after i installed BIOS 0805 i've been having these Write issues (i didn't check after i installed 0805 instantly but i checked a few days after i installed it for sure), that BIOS also includes the new Intel ME update (Management Engine), i think that is related to the new Spectre Variant 4

while benchmarking my SSD with DiskMark my SSD starts with 530mb/s with 500-100ms average latency (according to Task Manager), then it quickly drops down to 330mb/s and the latency jumps to 16000ms and it stays there.

 

what the hell seems to be the problem? i really don't get it...

i really need more information about this, and if someone has the same board or similar ASUS board with the same BIOS.

(i do not have another system to test unfortunately) 

[.Apex.]

also i have another SSD and an HDD, and they both also spike to 16000ms while writing, i just need more information to confirm if its either Windows updates or BIOS updates.