Why does my screen locks when i press home button?

I recently got a ipad mini and sometimes the screen locks by itself when i'm in the middle of watching a video or when i press the home button. Anybody have any idea why is it doing this?

i have the same problem.  did you ever find out what causes this?
thx

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    Interval Since Last Panic Report:  1949305 sec
    Panics Since Last Report:          1
    Thu Feb  6 15:29:32 2014
    panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff7f81d89ff3, type 14=page fault, registers:
    CR0: 0x0000000080010033, CR2: 0xffffff7acd4a2a7c, CR3: 0x0000000085d3b000, CR4: 0x0000000000000660
    RAX: 0xffffffff4bffff56, RBX: 0x0000000000000000, RCX: 0x0000000000000001, RDX: 0x0000000000000000
    RSP: 0xffffff807867b7c0, RBP: 0xffffff807867b800, RSI: 0xffffff7acd4a2a7c, RDI: 0xffffff8065292000
    R8:  0x0000000000000001, R9:  0x0000000000000000, R10: 0xffffff7f81d44200, R11: 0xffffff800f8b45e8
    R12: 0xffffff8065292000, R13: 0xffffff807867b860, R14: 0x0000000000000001, R15: 0xffffff7acd4a2a7c
    RFL: 0x0000000000010286, RIP: 0xffffff7f81d89ff3, CS:  0x0000000000000008, SS:  0x0000000000000010
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    0xffffff807867b470 : 0xffffff8000220792
    0xffffff807867b4f0 : 0xffffff80002c4794
    0xffffff807867b6a0 : 0xffffff80002da55d
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    0xffffff807867b800 : 0xffffff7f81d8a694
    0xffffff807867b890 : 0xffffff7f81d8b4ed
    0xffffff807867b8d0 : 0xffffff7f81d472a1
    0xffffff807867ba40 : 0xffffff7f81d8bd6d
    0xffffff807867bb00 : 0xffffff7f81d44346
    0xffffff807867bb60 : 0xffffff8000655f3e
    0xffffff807867bb80 : 0xffffff800065681a
    0xffffff807867bbe0 : 0xffffff8000656fbb
    0xffffff807867bd20 : 0xffffff80002a3f08
    0xffffff807867be20 : 0xffffff8000223096
    0xffffff807867be50 : 0xffffff80002148a9
    0xffffff807867beb0 : 0xffffff800021bbd8
    0xffffff807867bf10 : 0xffffff80002af140
    0xffffff807867bfb0 : 0xffffff80002dab5e
          Kernel Extensions in backtrace:
             com.apple.GeForce(7.3.2)[7E1D7726-416F-3716-ACCB-E1E276E35002]@0xffffff7f81d390 00->0xffffff7f81dfbfff
                dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f808 b0000
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                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f80865000
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    Kernel version:
    Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
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    System uptime in nanoseconds: 11526391261403
    last loaded kext at 23020191300: com.apple.driver.AppleHWSensor    1.9.5d0 (addr 0xffffff7f8234b000, size 28672)
    last unloaded kext at 522057763087: com.apple.driver.AppleFileSystemDriver    13 (addr 0xffffff7f8254c000, size 12288)
    loaded kexts:
    com.apple.driver.AppleHWSensor    1.9.5d0
    com.apple.driver.AppleBluetoothMultitouch    70.12
    com.apple.filesystems.autofs    3.0
    com.apple.iokit.IOBluetoothSerialManager    4.0.8f17
    com.apple.driver.AudioAUUC    1.59
    com.apple.driver.AppleMikeyHIDDriver    122
    com.apple.driver.AppleHDA    2.2.5a5
    com.apple.driver.AppleUpstreamUserClient    3.5.9
    com.apple.driver.AppleMikeyDriver    2.2.5a5
    com.apple.driver.AppleBacklight    170.2.2
    com.apple.driver.AppleMCCSControl    1.0.33
    com.apple.driver.AppleLPC    1.6.0
    com.apple.driver.AGPM    100.12.75
    com.apple.iokit.IOUserEthernet    1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X    7.0.0
    com.apple.driver.AudioIPCDriver    1.2.3
    com.apple.driver.ApplePolicyControl    3.1.33
    com.apple.GeForce    7.3.2
    com.apple.driver.ACPI_SMC_PlatformPlugin    5.0.0d8
    com.apple.driver.BroadcomUSBBluetoothHCIController    4.0.8f17
    com.apple.driver.AppleUSBCardReader    3.0.6
    com.apple.driver.AppleIRController    312
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
    com.apple.BootCache    33
    com.apple.iokit.SCSITaskUserClient    3.2.1
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    com.apple.driver.AppleSMBIOS    1.9
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    com.apple.driver.AppleAPIC    1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient    195.0.0
    com.apple.nke.applicationfirewall    3.2.30
    com.apple.security.quarantine    1.4
    com.apple.security.TMSafetyNet    8
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    com.apple.driver.AppleMultitouchDriver    231.4
    com.apple.driver.IOBluetoothHIDDriver    4.0.8f17
    com.apple.kext.triggers    1.0
    com.apple.iokit.IOSerialFamily    10.0.5
    com.apple.driver.DspFuncLib    2.2.5a5
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    com.apple.driver.AppleSMBusController    1.0.10d0
    com.apple.driver.AppleSMBusPCI    1.0.10d0
    com.apple.iokit.IOSurface    80.0.2
    com.apple.iokit.IOAudioFamily    1.8.6fc18
    com.apple.kext.OSvKernDSPLib    1.3
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    com.apple.driver.AppleHDAController    2.2.5a5
    com.apple.iokit.IOHDAFamily    2.2.5a5
    com.apple.nvidia.nv50hal    7.3.2
    com.apple.NVDAResman    7.3.2
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    com.apple.iokit.IOFireWireIP    2.2.5
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    com.apple.iokit.IONetworkingFamily    2.1
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    com.apple.driver.AppleEFIRuntime    1.6.1
    com.apple.iokit.IOSMBusFamily    1.1
    com.apple.security.sandbox    177.11
    com.apple.kext.AppleMatch    1.0.0d1
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    com.apple.iokit.IOStorageFamily    1.7.2
    com.apple.driver.AppleKeyStore    28.18
    com.apple.driver.AppleACPIPlatform    1.5
    com.apple.iokit.IOPCIFamily    2.7
    com.apple.iokit.IOACPIFamily    1.4
    System Profile:
    Model: iMac10,1, BootROM IM101.00CC.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.52f9
    Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
    Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
    Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
    Serial ATA Device: ST3500418ASQ, 500.11 GB
    Serial ATA Device: HL-DT-ST DVDRW  GA11N
    USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 2
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 3
    USB Device: USB2.0 Hub, 0x05e3  (Genesys Logic, Inc.), 0x0608, 0x26200000 / 2
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
    USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1003, 0x06400000 / 3
    USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x020b, 0x06430000 / 4
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 6

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