Cluster Disk keeps going offline. Service or application failed

We currently have 2 servers, both housing 3 VMs (6 nodes total).  2 Disk are used to house these VM's.  Cluster Disk 1 keeps going offline, which kicks 2 of our servers offline until we migrate the disk to another node (puts it into redirected mode).  We then have to restart the server to re-establish to connection to the cluster disk.  Digging around in event viewer, I saw the following:

Cluster resource 'Cluster Disk 2' in clustered service or application 'b0a21897-e59b-46c9-a495-273dc5ad2aea' failed.

Cluster physical disk resource 'Cluster Disk 2' cannot be brought online because the associated disk could not be found. The expected signature of the disk was '{92eb716c-6878-42ad-b7de-f3879d72e232}'. If the disk was replaced or restored, in the Failover Cluster Manager snap-in, you can use the Repair function (in the properties sheet for the disk) to repair the new or restored disk. If the disk will not be replaced, delete the associated disk resource.

The Cluster service failed to bring clustered service or application 'b0a21897-e59b-46c9-a495-273dc5ad2aea' completely online or offline. One or more resources may be in a failed state. This may impact the availability of the clustered service or application.

I ran the cluster validation test and all seemed to check out except for Cluster Disk 1 and the two servers associated with this server, as shown below:

Validating cluster resource Cluster Disk 2.

This resource is marked with a state of 'Offline'. The functionality that this resource provides is not available while it is in the offline state. The resource may be put in this state by an administrator or program. It may also be a newly created resource which has not been put in the online state or the resource may be dependent on a resource that is not online. Resources can be brought online by choosing the 'Bring this resource online' action in Failover Cluster Manager.

This resource is marked with a state of 'Failed' instead of 'Online'. This failed state indicates that the resource had a problem either coming online or had a failure while it was online. The event logs and cluster logs may have information that is helpful in identifying the cause of the failure.

All disks are housed on our SAN.  Any idea where I can start troubleshooting further?  Changing the signature of the disk or finding out which application is failing?  All help is greatly appreciated.