Q: My MBP 13" late 2011 restarts unexpectedly at least once a day.

In one instance it shut down and could not restart, I was advised by an authorised agent to replace the hard disk. I did that but am still getting the 'unexpected restarts'. Pse see console output below (I do not understand any bit of it but I see its required on this forum).

Tue Aug 11 09:57:04 2015

*** Panic Report ***

panic(cpu 0 caller 0xffffff800c61e80a): Kernel trap at 0xffffff7f8d77a06f, type 14=page fault, registers:

CR0: 0x000000008001003b, CR2: 0xffffff8825658480, CR3: 0x000000000f36b000, CR4: 0x00000000000626e0

RAX: 0x0000000000000000, RBX: 0xffffff801dcb7c00, RCX: 0xffffff80ed91f000, RDX: 0xffffff811681b728

RSP: 0xffffff811681b800, RBP: 0xffffff811681b840, RSI: 0x0fffffffffffff01, RDI: 0xffffff802521fc00

R8:  0xffffff8825658480, R9:  0xffffff800ccd49e8, R10: 0xffffff800cb55a60, R11: 0x000000000000000b

R12: 0xffffff801f705800, R13: 0xffffff802e533700, R14: 0x0000000000000001, R15: 0xffffff7f8d7ba2f0

RFL: 0x0000000000010286, RIP: 0xffffff7f8d77a06f, CS:  0x0000000000000008, SS:  0x0000000000000010

Fault CR2: 0xffffff8825658480, Error code: 0x0000000000000000, Fault CPU: 0x0

Backtrace (CPU 0), Frame : Return Address

0xffffff811681b4b0 : 0xffffff800c53a811

0xffffff811681b530 : 0xffffff800c61e80a

0xffffff811681b6f0 : 0xffffff800c63a443

0xffffff811681b710 : 0xffffff7f8d77a06f

0xffffff811681b840 : 0xffffff7f8d753536

0xffffff811681b890 : 0xffffff7f8d74a684

0xffffff811681bee0 : 0xffffff7f8d7492cf

0xffffff811681bef0 : 0xffffff7f8d746c42

0xffffff811681bf30 : 0xffffff7f8d78d6dd

0xffffff811681bf50 : 0xffffff7f8d78d68c

0xffffff811681bf70 : 0xffffff7f8d78d702

0xffffff811681bf90 : 0xffffff7f8d78d7fc

0xffffff811681bfb0 : 0xffffff800c6192c7

      Kernel Extensions in backtrace:

         com.apple.iokit.IOBluetoothFamily(4.3f10)[9609EEC1-A7D4-31A5-A682-30361EF68714] @0xffffff7f8d73f000->0xffffff7f8d7e8fff

            dependency: com.apple.iokit.IOReportFamily(31)[781C9DD1-4CE9-3AEB-85EA-D420CEC18916]@0xffff ff7f8d58d000

BSD process name corresponding to current thread: kernel_task

Mac OS version:

14A389

Kernel version:

Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64

Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61

Kernel slide:     0x000000000c200000

Kernel text base: 0xffffff800c400000

__HIB  text base: 0xffffff800c300000

System model name: MacBookPro8,1 (Mac-94245B3640C91C81)

System uptime in nanoseconds: 152325293083

last loaded kext at 6587213543: com.apple.driver.AudioAUUC 1.70 (addr 0xffffff7f8e39f000, size 32768)

loaded kexts:

com.apple.driver.AudioAUUC 1.70

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AppleTyMCEDriver 1.0.2d2

com.apple.driver.AGPM 100.14.37

com.apple.iokit.IOBluetoothSerialManager 4.3.0f10

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleHDAHardwareConfigDriver 266.5

com.apple.driver.AppleHDA 266.5

com.apple.driver.AppleMikeyDriver 266.5

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleBacklight 170.4.12

com.apple.driver.AppleMuxControl 3.7.21

com.apple.driver.ApplePolicyControl 3.7.21

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.driver.AppleThunderboltIP 2.0.2

com.apple.driver.AppleLPC 1.7.3

com.apple.driver.AppleHWAccess 1

com.apple.driver.AppleHV 1

com.apple.driver.AppleMCCSControl 1.2.10

com.apple.driver.AppleIntelHD3000Graphics 10.0.0

com.apple.driver.SMCMotionSensor 3.0.4d1

com.apple.iokit.IOBluetoothUSBDFU 4.3.0f10

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleSMCLMU 2.0.4d1

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0

com.apple.driver.AppleUSBTCButtons 240.2

com.apple.driver.AppleUSBTCKeyEventDriver 240.2

com.apple.driver.AppleUSBTCKeyboard 240.2

com.apple.driver.AppleIRController 327.5

com.apple.driver.AppleFileSystemDriver 3.0.1

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 35

com.apple.iokit.SCSITaskUserClient 3.7.0

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.6.5

com.apple.driver.AppleUSBHub 705.4.1

com.apple.driver.AppleSDXC 1.6.5

com.apple.iokit.AppleBCM5701Ethernet 10.1.2b3

com.apple.driver.AirPort.Brcm4331 800.20.24

com.apple.driver.AirPort.Brcm4360 900.19.8

com.apple.driver.AppleFWOHCI 5.5.2

com.apple.driver.AppleUSBUHCI 656.4.1

com.apple.driver.AppleAHCIPort 3.0.7

com.apple.driver.AppleUSBEHCI 705.4.14

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleACPIButtons 3.1

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 3.1

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0

com.apple.nke.applicationfirewall 161

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 218.0.0

com.apple.kext.triggers 1.0

com.apple.AppleGraphicsDeviceControl 3.7.21

com.apple.iokit.IOSerialFamily 11

com.apple.driver.DspFuncLib 266.5

com.apple.kext.OSvKernDSPLib 1.15

com.apple.iokit.IOAudioFamily 200.6

com.apple.vecLib.kext 1.2.0

com.apple.iokit.IOSurface 97

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.driver.AppleGraphicsControl 3.7.21

com.apple.driver.AppleThunderboltEDMSink 4.0.2

com.apple.driver.AppleThunderboltDPOutAdapter 4.0.6

com.apple.driver.AppleHDAController 266.5

com.apple.iokit.IOHDAFamily 266.5

com.apple.driver.AppleSMBusController 1.0.13d1

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10

com.apple.iokit.IOBluetoothFamily 4.3.0f10

com.apple.iokit.IOUSBUserClient 705.4.0

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.IOPlatformPluginFamily 5.8.0d49

com.apple.driver.AppleSMBusPCI 1.0.12d1

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.driver.AppleUSBMultitouch 245.2

com.apple.iokit.IOUSBHIDDriver 705.4.0

com.apple.driver.AppleUSBMergeNub 705.4.0

com.apple.driver.AppleUSBComposite 705.4.9

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.0

com.apple.iokit.IOBDStorageFamily 1.7

com.apple.iokit.IODVDStorageFamily 1.7.1

com.apple.iokit.IOCDStorageFamily 1.7.1

com.apple.driver.AppleThunderboltDPInAdapter 4.0.6

com.apple.driver.AppleThunderboltDPAdapterFamily 4.0.6

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.iokit.IOAHCISerialATAPI 2.6.1

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.0

com.apple.driver.AppleThunderboltNHI 3.1.7

com.apple.iokit.IOThunderboltFamily 4.2.1

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.iokit.IO80211Family 700.52

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.iokit.IOFireWireFamily 4.5.6

com.apple.iokit.IOAHCIFamily 2.7.0

com.apple.iokit.IOUSBFamily 705.4.14

com.apple.driver.AppleEFINVRAM 2.0

com.apple.driver.AppleEFIRuntime 2.0

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.DiskImages 389.1

com.apple.iokit.IOStorageFamily 2.0

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 3.1

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0

com.apple.kec.Libm 1

com.apple.kec.pthread 1