Can only bring some CSV's online on one specific host

Hi.
I have a three node Hyper-V (2012 R2) cluster.
It has 12 CSV's connected. Two of the CSV's can only be brought online on one of the hosts. It seems, they are locked to that host in some way.
The end result is that when I take that host down for maintenance, the two CSV's go offline and all VM's on them, crash.
I suspect a particular VM of causing this but I don't know how to fix the problem.
Anyone?
Thanks in advance.
/Michael

What size are the CSV and is the storage connected via iSCSI, Fibre or SMB?
If Fibre or iSCSI, check that the SAN is configured to allows all three hosts to connect to the storage group and each has access to all LUNS from a SAN point of view. If iSCSI check the Initiator and the MPIO settings on all three host etc.
With regards to the Access denied, have a scan through this link it maybe of help and check if the VM worker process (VMMS) has the relevant permissions on the CSV volume. 
http://blogs.technet.com/b/askcore/archive/2014/10/01/virtual-machine-checkpoint-fails-with-access-denied-when-running-on-a-clustered-shared-volume.aspx
If possible, I think i would attempt to move the VMs of the storage, remove and re-present it or increase the size of the other CSV. The number of CSV is down to design, connections the SAN can support and various other things and although 12 is a lot of
CSV for three nodes, as mentioned above it should work and there are many cluster with a lot more.
I know its a pain, but I would really try to run the validation wizard to check widows updates match etc. Also have you checked all firmware updates for HBAs or NICs etc?
Kind Regards
Michael Coutanche
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Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

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