Unable to access Parity Volume on Storage spaces

I have raised a case with Microsoft support, but posting here to hopefully get a faster response (case raised almost a week ago!)

I have a Windows Server 2012 file server, 4 USB3 disks, 4TB each, brand new. Created a new storage pool for the disks, created a single virtual disk, parity redundancy, thick provisioned to consume all available space in the pool. New NTFS volume on top (entire disk).

Volume worked well for 4 weeks, went to create a new file share, system crashed, now volume is unavailable. I can see the drive letter, but accessing the drive causes the system to become unstable.

Some diagnostic information:

PS C:\Users\Administrator> Get-PhysicalDisk

FriendlyName        CanPool             OperationalStatus   HealthStatus        Usage                             Size
------------        -------             -----------------   ------------        -----                             ----
PhysicalDisk3       False               OK                  Healthy             Auto-Select                    3.64 TB
PhysicalDisk6       False               OK                  Healthy             Auto-Select                    3.64 TB
PhysicalDisk5       False               OK                  Healthy             Auto-Select                    3.64 TB
PhysicalDisk0       False               OK                  Healthy             Auto-Select                  931.51 GB
PhysicalDisk1       False               OK                  Healthy             Auto-Select                    2.73 TB
PhysicalDisk2       False               OK                  Healthy             Auto-Select                    1.36 TB
PhysicalDisk4       False               OK                  Healthy             Auto-Select                    3.64 TB


PS C:\Users\Administrator> Get-StoragePool

FriendlyName            OperationalStatus       HealthStatus            IsPrimordial            IsReadOnly
------------            -----------------       ------------            ------------            ----------
GLADOS-USB3-4TB         OK                      Healthy                 False                   False
Primordial              OK                      Healthy                 True                   False


PS C:\Users\Administrator> Get-VirtualDisk

FriendlyName        ResiliencySettingNa OperationalStatus   HealthStatus        IsManualAttach                     Size
                    me
------------        ------------------- -----------------   ------------        --------------                     ----
GLADOS-USB3-4TB-PAR Parity              OK                  Healthy             True                          10.91 TB


PS C:\Users\Administrator>

As you can see, everything looks very good, but try as you might, you just cannot read the NTFS file system on that virtual disk.

I tried repair-virtual disk, but it says their is nothing to do, I tried repair volume but it just sits there and doesn't do anything.

The machine is backed up to an extent, but I am very frustrated at this whole thing and would like some of the non-backed up data back too. Also, its hard to sell this new technology to customers if its this unstable.

Does anyone have any suggestions? please?