Help! MacAir 13 occationally frozen, seems like a piece of hardware problem?

     I got a mac air 2011 with 13inch-screen. Recently it occationally freezes(like once or twice in a day). when it happens, the mouse cursor's frozen, movie playing's halted, and the only key in the keyboard still working is the "power" key.
     Until now, I can only reset the machine by holding the power key, and press again to boot up. and yet haven't found any paticular software that causes the  problem. what's more, I recently upgrade the OS from "Lion" to the "Mountain Lion", and still the problem remains.
     I wonder if it's a fault in mainboard or power facility that leads to this annoying problem. Help me out please!

Hey,I got a kernel panic just now, see if it's helpful to locate the problem.
Mon Jul 30 10:41:05 2012
panic(cpu 3 caller 0xffffff802e2b7b95): Kernel trap at 0xffffff7faf99cdbf, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0xffffff80db69f000, CR3: 0x000000004402302c, CR4: 0x00000000000606e0
RAX: 0xffffff80db69f000, RBX: 0xffffff8045d86b80, RCX: 0xffffff80db69f000, RDX: 0xffffff80db6d1000
RSP: 0xffffff80ad2fbb10, RBP: 0xffffff80ad2fbb10, RSI: 0xffffff80db5a5000, RDI: 0x0000000000000040
R8:  0xffffff80a7255078, R9:  0x7ffffffffffffffe, R10: 0xffffff803b29cdb3, R11: 0x0000000000000201
R12: 0x0000000000000000, R13: 0xffffff8098cef301, R14: 0xffffff8098cef000, R15: 0xffffff80db5a5000
RFL: 0x0000000000010287, RIP: 0xffffff7faf99cdbf, CS:  0x0000000000000008, SS:  0x0000000000000010
Fault CR2: 0xffffff80db69f000, Error code: 0x0000000000000000, Fault CPU: 0x3
Backtrace (CPU 3), Frame : Return Address
0xffffff80ad2fb7b0 : 0xffffff802e21d5f6
0xffffff80ad2fb820 : 0xffffff802e2b7b95
0xffffff80ad2fb9f0 : 0xffffff802e2ce4ad
0xffffff80ad2fba10 : 0xffffff7faf99cdbf
0xffffff80ad2fbb10 : 0xffffff7faf9ace19
0xffffff80ad2fbba0 : 0xffffff802e664929
0xffffff80ad2fbbc0 : 0xffffff802e665ed0
0xffffff80ad2fbc20 : 0xffffff802e6638ef
0xffffff80ad2fbd70 : 0xffffff802e2981a1
0xffffff80ad2fbe80 : 0xffffff802e220abd
0xffffff80ad2fbeb0 : 0xffffff802e210448
0xffffff80ad2fbf00 : 0xffffff802e2195fb
0xffffff80ad2fbf70 : 0xffffff802e2a5ad6
0xffffff80ad2fbfb0 : 0xffffff802e2ced13
      Kernel Extensions in backtrace:
         com.apple.driver.AppleIntelHD3000Graphics(8.0)[3E22E6B1-7098-3FCC-8173-CE91AE91 0DA0]@0xffffff7faf996000->0xffffff7faf9f7fff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7fae88a000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[E37F420A-B5CD-38ED-9441-5247583B6ACE]@0xff ffff7faedb3000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[5D671681-D21B-3CCA-9810-B15E648C1B27]@0 xffffff7faed70000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
12A269
Kernel version:
Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64
Kernel UUID: 8D5F8EF3-9D12-384B-8070-EF2A49C45D24
Kernel slide:     0x000000002e000000
Kernel text base: 0xffffff802e200000
System model name: MacBookAir4,2 (Mac-742912EFDBEE19B3)
System uptime in nanoseconds: 490154820217
last loaded kext at 370522129767: com.apple.filesystems.smbfs    1.8 (addr 0xffffff7fafec3000, size 229376)
last unloaded kext at 150996484997: com.apple.driver.AppleUSBUHCI    5.1.5 (addr 0xffffff7faeb50000, size 65536)
loaded kexts:
com.expandrive.ExpanDrive.expandrivefs    3.1.0
com.parallels.kext.prl_vnic    7.0 15104.778994
com.parallels.kext.prl_netbridge    7.0 15104.778994
com.parallels.kext.prl_hid_hook    7.0 15104.778994
org.virtualbox.kext.VBoxNetAdp    4.1.6
com.parallels.kext.prl_hypervisor    7.0 15104.778994
org.virtualbox.kext.VBoxNetFlt    4.1.6
com.parallels.kext.prl_usb_connect    7.0 15104.778994
org.virtualbox.kext.VBoxUSB    4.1.6
org.virtualbox.kext.VBoxDrv    4.1.6
com.apple.filesystems.smbfs    1.8
com.apple.driver.AppleIntelProfile    97
com.apple.driver.AudioAUUC    1.60
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.filesystems.autofs    3.0
com.apple.iokit.IOBluetoothSerialManager    4.0.9f8
com.apple.driver.ApplePlatformEnabler    2.0.5d4
com.apple.driver.AGPM    100.12.69
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleHDA    2.3.0f2
com.apple.driver.AppleMikeyDriver    2.3.0f2
com.apple.driver.AppleUpstreamUserClient    3.5.10
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.ApplePolicyControl    3.2.6
com.apple.driver.AppleLPC    1.6.0
com.apple.driver.AppleSMCLMU    2.0.2d0
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.driver.AppleBacklight    170.2.3
com.apple.driver.AppleMCCSControl    1.0.33
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport    4.0.9f8
com.apple.driver.AppleIntelHD3000Graphics    8.0.0
com.apple.driver.AppleIntelSNBGraphicsFB    8.0.0
com.apple.driver.AppleSMCPDRC    1.0.0
com.apple.driver.AppleUSBTCButtons    235.4
com.apple.driver.AppleUSBTCKeyboard    235.4
com.apple.driver.AppleUSBCardReader    3.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    34
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.2.0
com.apple.driver.AppleUSBHub    5.1.6
com.apple.driver.AirPort.Brcm4331    600.15.20
com.apple.driver.AppleAHCIPort    2.4.0
com.apple.driver.AppleUSBEHCI    5.1.5
com.apple.driver.AppleEFINVRAM    1.6.1
com.apple.driver.AppleSmartBatteryManager    161.0.0
com.apple.driver.AppleRTC    1.5
com.apple.driver.AppleACPIButtons    1.6
com.apple.driver.AppleHPET    1.7
com.apple.driver.AppleSMBIOS    1.9
com.apple.driver.AppleACPIEC    1.6
com.apple.driver.AppleAPIC    1.6
com.apple.driver.AppleIntelCPUPowerManagementClient    196.0.0
com.apple.nke.applicationfirewall    4.0.39
com.apple.security.quarantine    2
com.apple.driver.AppleIntelCPUPowerManagement    196.0.0
com.apple.driver.AppleProfileTimestampAction    97
com.apple.driver.AppleProfileThreadInfoAction    97
com.apple.driver.AppleProfileRegisterStateAction    97
com.apple.driver.AppleProfileReadCounterAction    97
com.apple.driver.AppleProfileKEventAction    97
com.apple.driver.AppleProfileCallstackAction    97
com.apple.iokit.AppleProfileFamily    97
com.apple.kext.triggers    1.0
com.apple.driver.DspFuncLib    2.3.0f2
com.apple.iokit.IOAudioFamily    1.8.9fc9
com.apple.kext.OSvKernDSPLib    1.6
com.apple.iokit.IOSurface    86.0.2
com.apple.iokit.IOBluetoothFamily    4.0.9f8
com.apple.driver.AppleHDAController    2.3.0f2
com.apple.iokit.IOHDAFamily    2.3.0f2
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleSMC    3.1.3d11
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.AppleGraphicsControl    3.2.6
com.apple.driver.AppleBacklightExpert    1.0.4
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport    4.0.9f8
com.apple.iokit.IOSerialFamily    10.0.6
com.apple.iokit.IONDRVSupport    2.3.4
com.apple.iokit.IOGraphicsFamily    2.3.4
com.apple.driver.IOPlatformPluginFamily    5.2.0d16
com.apple.driver.AppleThunderboltDPInAdapter    1.8.5
com.apple.driver.AppleThunderboltDPAdapterFamily    1.8.5
com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.5
com.apple.driver.AppleUSBMultitouch    235.7
com.apple.iokit.IOUSBHIDDriver    5.0.0
com.apple.iokit.IOSCSIBlockCommandsDevice    3.5.1
com.apple.iokit.IOUSBMassStorageClass    3.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.5.1
com.apple.driver.AppleUSBMergeNub    5.1.5
com.apple.driver.AppleUSBComposite    5.0.0
com.apple.iokit.IO80211Family    500.15
com.apple.iokit.IONetworkingFamily    3.0
com.apple.iokit.IOUSBUserClient    5.0.0
com.apple.iokit.IOAHCIFamily    2.2.0
com.apple.driver.AppleThunderboltNHI    1.6.0
com.apple.iokit.IOThunderboltFamily    2.0.3
com.apple.iokit.IOUSBFamily    5.1.6
com.apple.driver.AppleEFIRuntime    1.6.1
com.apple.iokit.IOHIDFamily    1.8.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    220
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    7
com.apple.driver.DiskImages    344
com.apple.iokit.IOStorageFamily    1.8
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.6
com.apple.iokit.IOPCIFamily    2.7
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.corecrypto    1.0

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