Can you show us the config of the VM?
Code:qm config <vmid>
agent: 1
bootdisk: ide1
cores: 4
ide0: VNX02_16TB01_vg:vm-152-disk-1,size=750G
ide1: VNX02_16TB01_vg:vm-152-disk-0,size=250G
ide2: none,media=cdrom
ide3: VNX02_16TB01_vg:vm-152-disk-2,size=500G
memory: 32768
name: e2k13dag.domain.local
net0: virtio=0E:25*********:D2,bridge=vmbr0,tag=38
numa: 0
ostype: win8
scsihw: virtio-scsi-pci
smbios1: uuid=850dba50-0017-4804-8f10-3992ac5f25bd
sockets: 2
vmgenid: c659632e-cc62-4c74-8120-7be810f44568
I've found resolution.You could try to change the disks from IDE to SCSI or Virtio. For Windows though you first need to install the drivers and attach a small dummy disk with that bus type before you change the other disks. The procedure is explained at the bottom of that PVE wiki page.
Also, don't forget to adjust the boot order in the VM options!
Yes, we have some VM's w IDE bus based on Windows or Linux OSDo the other VMs that did not freeze, also use the IDE bus for their disks?