Not sure what your problem is, but I see that you have the 'system' share where docker is installed set to Use Cache=Yes which means that mover will be trying to move its contents to the array. Not sure if this can affect docker when using a folder for the docker images.
The 'appdata' share also has part of its contents on the array despite it being set to Use Cache=Prefer. You should probably get all of that share moved to the cache as well.
The diagnostics would not show any SMART information for the ache drive so cannot check its status. It might be worth running a scrub on it to check that there is no file system level corruption.
It looked as if the diagnostics posted are just after a reboot, so after tidying up the points mentioned above if the problem still persists then post new diagnostics taken at that point the problem occurs so we can see the failure you are getting.