hdd disk usage goes to 100 % creating massive frame drop rare and at random

I am running a AMD threadripper 3970 o.c. @ 5.1 GHZ with refrigerated water cooling  with 128 gigs of 4000 mhz gskill  royal trident gold on a Taichi trx40 mobo with 4 sabrent rocket 4 pluses in a raid 0 array with a 2080  ti fe also water cooled.

Temps are really low and when the game stutters it is claiming 99 percent disk usage at only 80mb a sec and the only thing  using hdd access is the game, and in fact the raid is capable of way more than than by a staggering amount.

It happens at random and is quite rare, most commonly while playing my usage is at 0 -1%.

I do not have this issue with any other game program ect. I have tried running stock clocks on cpu and ram and gpu to see if that was the issue, it was not. I have tried different drivers , I have reinstalled the game all to no avail.

I have many other games I play and do not have this issue in any of them.

. Any foresight or help would be greatly appreciated !

Thank you in advance I appreciate your time and effort.

sincerely Marc Ellis