I had no end of performance problems since the Windows 1803 update.

After  some endless stuffing about, including a Clean Install of Windows, I find IAstoreA (Event 129) Reset to device, \Device\RaidPort0, was issued - coinciding with disc locks/app freezes.

Disabling LPM, in this case, seems to have solved the issue.

What I'd like to know is; How is this driver/app not compatible with Win 1803 in the first place?
Believe me, it is the latest version of any such thing  - released 30 July, according to Dell website - and somewhat later than when I received the Windows 1803 update.