The virtual machine loses its drive. Help please!

Virtual machine with vcenter onboard gets its virtual disk unexpectedly unmounted while data protector is performing some backup operations. Windows server goes to BSOD and vm cannot start - operating system not found. Now this is happening almost every day. Help please!

2015-11-10T21:38:02.259Z| vcpu-0| I120: LSI:Event notification sent for SAS device scsi0:0...

2015-11-10T21:38:02.262Z| vcpu-0| I120: Destroying virtual dev for scsi0:0 vscsi=8850

2015-11-10T21:38:02.262Z| vcpu-0| I120: VMMon_VSCSIStopVports: No such target on adapter

2015-11-10T21:38:02.303Z| vcpu-0| I120: scsi0:0: numIOs = 0 numMergedIOs = 0 numSplitIOs = 0 ( 0.0%)

2015-11-10T21:38:02.303Z| vcpu-0| I120: Closing disk scsi0:0

2015-11-10T21:38:02.306Z| vcpu-0| I120: DISKLIB-CBT   : Shutting down change tracking for untracked fid 610996176.

2015-11-10T21:38:02.306Z| vcpu-0| I120: DISKLIB-CBT   : Successfully disconnected CBT node.

2015-11-10T21:38:02.524Z| vcpu-0| I120: DISKLIB-VMFS  : "/vmfs/volumes/4e172714-a5a16bbd-eedf-002264997d72/vcs/vcs-flat.vmdk" : closed.

2015-11-10T21:38:02.525Z| vcpu-0| A115: ConfigDB: Setting scsi0:0.present = "false"

2015-11-10T21:38:04.727Z| mks| I120: SVGA disabling SVGA

2015-11-10T21:38:04.741Z| svga| I120: WinBSOD: ( 1) `A problem has been detected and Windows has been shut down to prevent damage    '

2015-11-10T21:38:04.741Z| svga| I120: WinBSOD: ( 2) `to your computer. '

2015-11-10T21:38:04.741Z| svga| I120: WinBSOD: ( 5) `A process or thread crucial to system operation has unexpectedly exited or been '

2015-11-10T21:38:04.741Z| svga| I120: WinBSOD: ( 6) `terminated. '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: ( 😎 `If this is the first time you've seen this Stop error screen, '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: ( 9) `restart your computer. If this screen appears again, follow '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (10) `these steps: '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (12) `Check to make sure any new hardware or software is properly installed.          '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (13) `If this is a new installation, ask your hardware or software manufacturer       '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (14) `for any Windows updates you might need. '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (16) `If problems continue, disable or remove any newly installed hardware            '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (17) `or software. Disable BIOS memory options such as caching or shadowing.          '

2015-11-10T21:38:04.742Z| svga| I120: WinBSOD: (18) `If you need to use Safe Mode to remove or disable components, restart '

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (19) `your computer, press F8 to select Advanced Startup Options, and then            '

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (20) `select Safe Mode. '

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (22) `Technical information: '

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (24) `*** STOP: 0x000000F4 (0x0000000000000003,0xFFFFFA80C2AC7910,0xFFFFFA80C2AC7BF0,0'

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (25) `xFFFFF80001BD3460) '

2015-11-10T21:38:04.743Z| svga| I120: WinBSOD: (29) `Collecting data for crash dump ... '

2015-11-10T21:38:04.744Z| svga| I120: WinBSOD: (30) `Initializing disk for crash dump ... '

2015-11-10T21:38:04.860Z| vcpu-0| I120: CPU reset: soft (mode 2)

2015-11-10T21:38:04.860Z| vcpu-2| I120: CPU reset: soft (mode 1)

2015-11-10T21:38:04.861Z| vcpu-1| I120: CPU reset: soft (mode 1)

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