VM Losing Access to physical drives while running

I have a hyper-v based vm that I use as a media server. It is connected to 5 physical hard drives that it serves data from. After it is left running for some time the OS on the VM (Ubuntu server 18.04.1 LTS) starts giving IO Errors on all the drives. When
I check in hyper-v settings all of the physical hard drives show up as drive not found. shutting down the vm and re-selecting each of the drives from the drop down fixes the problem temporarily. This has been happening with increased frequency with the VM
sometimes lasting less than a few hours before the problem arises.

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