from dmesg:
Sorry but your HD is having problems, so make a backup of all important data to 
exclude loss of important document.

[    2.015469] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
[    2.015473] ata4.01: BMDMA stat 0x64
[    2.015478] ata4.01: failed command: READ DMA
[    2.015486] ata4.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 dma 4096 
in
[    2.015487]          res 51/84:00:07:00:00/00:00:00:00:00/f0 Emask 0x10 (ATA 
bus error)
[    2.015491] ata4.01: status: { DRDY ERR }
[    2.015494] ata4.01: error: { ICRC ABRT }
[    2.015521] ata4: soft resetting link
[    2.279730] ata4.00: configured for UDMA/100
[    2.284366] ata4.01: configured for UDMA/100
[    2.284377] ata4: EH complete
[    2.290387] ata4.01: limiting speed to UDMA/66:PIO4
[    2.290391] ata4.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
[    2.290394] ata4.01: BMDMA stat 0x64
[    2.290397] ata4.01: failed command: READ DMA
[    2.290405] ata4.01: cmd c8/00:08:00:00:00/00:00:00:00:00/f0 tag 0 dma 4096 
in
[    2.290406]          res 51/84:00:07:00:00/00:00:00:00:00/f0 Emask 0x10 (ATA 
bus error)
[    2.290410] ata4.01: status: { DRDY ERR }
Also try to verify the healt status with some tool.
Good luck
Fabio

** Tags added: hardware-error

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/789524

Title:
  system logoffs when try to play a vedio or audio file by double klick

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