My Imac says "you need to restart your computer" after logging out and click on sleep. 10.6.8?

Question

My Imac recently gives a message "you need to restart your computer"  after logging out and clicking "sleep".  After a few seconds, gray screeen will roll down and give that messasge.  I disconnected  USB cable from my  printer.  Today,  after turning it on,  the log in screen showed then after 2 seconds the gray screen rolled down again and prompted "you need to restart the computer". I've read the apple communities about kernel panics but to no success. I have a 10.6.8, 2.7 ghz, 4GB.  This is the error that showed which I reported to apple mutiple times already.
Panics Since Last Report:          4
Anonymous UUID:                    522B583E-D9D7-463D-B57E-6849A69E41D9
Wed Jan 22 11:52:33 2014
panic(cpu 0 caller 0xffffff80002d1208): Kernel trap at 0xffffff7f80e2750d, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x00000000000001e0, CR3: 0x0000000000100000, CR4: 0x0000000000040660
RAX: 0x000000000000000a, RBX: 0x00000000000001e0, RCX: 0x0000000001000000, RDX: 0x0000000000000000
RSP: 0xffffff805e413eb0, RBP: 0xffffff805e413f10, RSI: 0x00000000000000dd, RDI: 0xffffff800b3eb7e0
R8:  0x0000000000000003, R9:  0x0000000000000001, R10: 0x0000000000000007, R11: 0x0000000000000051
R12: 0x000000000000000a, R13: 0xffffff804aa59004, R14: 0xffffff800d15f1b4, R15: 0x0000000000000000
RFL: 0x0000000000010202, RIP: 0xffffff7f80e2750d, CS:  0x0000000000000008, SS:  0x0000000000000010
Error code: 0x0000000000000000
Backtrace (CPU 0), Frame : Return Address
0xffffff805e413b50 : 0xffffff8000204d15
0xffffff805e413c50 : 0xffffff80002d1208
0xffffff805e413da0 : 0xffffff80002e3f4a
0xffffff805e413db0 : 0xffffff7f80e2750d
0xffffff805e413f10 : 0xffffff7f80e7f7d3
0xffffff805e413f30 : 0xffffff800053e46d
0xffffff805e413f60 : 0xffffff8000285b66
0xffffff805e413fa0 : 0xffffff80002c8527
      Kernel Extensions in backtrace (with dependencies):
         com.apple.driver.AirPort.Atheros9388(426.35.3)@0xffffff7f80e1c000->0xffffff7f80 f66fff
            dependency: com.apple.iokit.IOPCIFamily(2.6.8)@0xffffff7f80804000
            dependency: com.apple.iokit.IO80211Family(320.1)@0xffffff7f80df7000
            dependency: com.apple.iokit.IONetworkingFamily(1.10)@0xffffff7f80ddd000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K549
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
System model name: iMac12,2 (Mac-942B59F58194171B)
System uptime in nanoseconds: 4614091555750
unloaded kexts:
com.apple.driver.AppleUSBUHCI          4.2.5 (addr 0xffffff7f80969000, size 0x65536) - last unloaded 128892379106
loaded kexts:
com.apple.filesystems.afpfs          9.7.1 - last loaded 1016854024083
com.apple.nke.asp_tcp          5.0
com.apple.filesystems.smbfs          1.6.7
com.apple.filesystems.autofs          2.1.0
com.apple.driver.AGPM          100.12.31
com.apple.driver.AppleHWSensor          1.9.3d0
com.apple.driver.AudioAUUC          1.57
com.apple.driver.AppleUpstreamUserClient          3.5.7
com.apple.driver.AppleMikeyHIDDriver          1.2.0
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleMikeyDriver          2.0.8f3
com.apple.kext.ATIFramebuffer          6.4.2
com.apple.driver.AppleIntelHDGraphics          6.4.2
com.apple.driver.AudioIPCDriver          1.1.6
com.apple.driver.AppleHDA          2.0.8f3
com.apple.ATIRadeonX3000          6.4.2
com.apple.iokit.AppleBCM5701Ethernet          3.0.8b2
com.apple.driver.AirPort.Atheros9388          426.35.3
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
com.apple.driver.AppleLPC          1.5.1
com.apple.driver.AppleBacklight          170.0.48
com.apple.kext.AppleSMCLMU          1.5.2d10
com.apple.driver.AppleIntelSNBGraphicsFB          6.4.2
com.apple.driver.AppleBluetoothMultitouch          54.3
com.apple.driver.AppleUSBCardReader          2.6.1
com.apple.driver.AppleIRController          303.8
com.apple.iokit.SCSITaskUserClient          2.6.9
com.apple.iokit.IOAHCIBlockStorage          1.6.6
com.apple.driver.AppleFWOHCI          4.7.7
com.apple.driver.AppleUSBHub          4.2.5
com.apple.BootCache          31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.driver.AppleEFINVRAM          1.4.0
com.apple.driver.AppleAHCIPort          2.2.0
com.apple.driver.AppleUSBEHCI          4.2.6
com.apple.driver.AppleACPIButtons          1.3.6
com.apple.driver.AppleRTC          1.3.1
com.apple.driver.AppleHPET          1.5
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.3.6
com.apple.driver.AppleAPIC          1.4
com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
com.apple.security.sandbox          1
com.apple.security.quarantine          0
com.apple.nke.applicationfirewall          2.1.14
com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
com.apple.driver.AppleProfileReadCounterAction          17
com.apple.driver.AppleProfileTimestampAction          10
com.apple.driver.AppleProfileThreadInfoAction          14
com.apple.driver.AppleProfileRegisterStateAction          10
com.apple.driver.AppleProfileKEventAction          10
com.apple.driver.AppleProfileCallstackAction          20
com.apple.iokit.IOSurface          74.2
com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
com.apple.iokit.IOSerialFamily          10.0.3
com.apple.driver.DspFuncLib          2.0.8f3
com.apple.iokit.IOAudioFamily          1.8.3fc2
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.driver.AppleBluetoothHIDKeyboard          141.5
com.apple.driver.AppleHIDKeyboard          141.5
com.apple.iokit.IOFireWireIP          2.0.4
com.apple.iokit.AppleProfileFamily          41
com.apple.driver.AppleHDAController          2.0.8f3
com.apple.iokit.IOHDAFamily          2.0.8f3
com.apple.driver.ApplePolicyControl          3.0.17
com.apple.driver.AppleGraphicsControl          3.0.17
com.apple.iokit.IO80211Family          320.1
com.apple.iokit.IONetworkingFamily          1.10
com.apple.driver.IOPlatformPluginFamily          4.7.0a1
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleBacklightExpert          1.0.2
com.apple.iokit.IONDRVSupport          2.2.1
com.apple.driver.AppleSMC          3.1.0d5
com.apple.driver.AppleThunderboltEDMSink          1.1.3
com.apple.driver.AppleThunderboltEDMSource          1.1.3
com.apple.kext.ATI6000Controller          6.4.2
com.apple.kext.ATISupport          6.4.2
com.apple.iokit.IOGraphicsFamily          2.2.1
com.apple.driver.IOBluetoothHIDDriver          2.4.5f3
com.apple.driver.AppleMultitouchDriver          207.11
com.apple.driver.AppleThunderboltDPOutAdapter          1.5.9
com.apple.driver.AppleThunderboltDPInAdapter          1.5.9
com.apple.driver.AppleThunderboltDPAdapterFamily          1.5.9
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.1
com.apple.iokit.IOUSBMassStorageClass          2.6.7
com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.9
com.apple.iokit.IOUSBHIDDriver          4.2.5
com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
com.apple.iokit.IOBluetoothFamily          2.4.5f3
com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.9
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.6
com.apple.iokit.IOCDStorageFamily          1.6.1
com.apple.driver.XsanFilter          402.1
com.apple.iokit.IOAHCISerialATAPI          1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.9
com.apple.driver.AppleThunderboltNHI          1.3.2
com.apple.iokit.IOThunderboltFamily          1.7.4
com.apple.driver.AppleUSBMergeNub          4.2.5
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOFireWireFamily          4.2.7
com.apple.iokit.IOUSBUserClient          4.2.4
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOUSBFamily          4.2.6
com.apple.driver.AppleEFIRuntime          1.4.0
com.apple.iokit.IOHIDFamily          1.6.6
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.TMSafetyNet          6
com.apple.kext.AppleMatch          1.0.0d1
com.apple.driver.DiskImages          289
com.apple.iokit.IOStorageFamily          1.6.3
com.apple.driver.AppleACPIPlatform          1.3.6
com.apple.iokit.IOPCIFamily          2.6.8
com.apple.iokit.IOACPIFamily          1.3.0
Model: iMac12,2, BootROM IM121.0047.B1F, 4 processors, Intel Core i5, 2.7 GHz, 4 GB, SMC 1.72f1
Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 512 MB
Memory Module: global_name
Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 0 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: ST31000528AS, 931.51 GB
Serial ATA Device: OPTIARC DVD RW AD-5680H
USB Device: FaceTime HD Camera (Built-in), 0x05ac  (Apple Inc.), 0x850b, 0xfa200000 / 3
USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8215, 0xfa111000 / 6
USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000 / 4
USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfd110000 / 3
What is going on with this error?

Answer 1

It hasn't been acting up since I:
1) Since I unplug my all in one printer with wifi (Hewlett Packard).  I barely use the printer and it keeps cleaning out the jets and wasting my **** ink.  Plus it'll do a loud self test @ 3:00 in the morning & by this time, I pulled my baseball bat from under the bed and ready to smash some skulls in the office room thinking its a burglar.
But seriously it stop doing it. 
This is a late reply but confirmed after 7 months.
Note:  I shut down instead of sleep my Imac now because I hardly use it.