2011 macbook freezes

Intermittent complete system freezes. White screen, sometimes glitchy lines. I have to hold the power button to restart. I have tried AHT, switch hardrive, switch RAM, downgrade to Lion, without peripherals, without power, problem persists. So it looks like a hardware problem but I've been reluctant to bring it in because the problem is not scientifically repeatable ie, there is no 1 way to cause a freeze. Although apple Photos often causes it and sometimes Adobe Illustrator, so... graphics intensive apps? But it will freeze if it's just sitting for awhile, too. Thanks for any insight / ideas ( or help decoding the crash report)

Late 2011 Macbook Pro 17" 2.4ghz i7 OSX 10.11.2

8gb 1333 ddr3 aftermarket RAM

240gb Samsung 850 ~40gb available

Most recent report:

Wed May 4 13:25:40 2016

*** Panic Report ***

panic(cpu 2 caller 0xffffff802cfd155a): Kernel trap at 0xffffff802cf86156, type 14=page fault, registers:

CR0: 0x0000000080010033, CR2: 0xffffff7f80000068, CR3: 0x000000005279f0ff, CR4: 0x00000000000626e0

RAX: 0xffffff7f80000000, RBX: 0xffffff8032cd6400, RCX: 0xffffff7f80000028, RDX: 0x0000000000000040

RSP: 0xffffff813765bcd0, RBP: 0xffffff813765bd00, RSI: 0x00000000475ceb1c, RDI: 0xffffff80323d3818

R8: 0xffffff804a33f1e0, R9: 0xffffff813765be90, R10: 0x0000000000000000, R11: 0x0000000000000246

R12: 0xffffff8043bcd780, R13: 0xffffff8031b35000, R14: 0x0000000000095000, R15: 0xffffff80323d3818

RFL: 0x0000000000010202, RIP: 0xffffff802cf86156, CS: 0x0000000000000008, SS: 0x0000000000000000

Fault CR2: 0xffffff7f80000068, Error code: 0x0000000000000000, Fault CPU: 0x2, PL: 1

Backtrace (CPU 2), Frame : Return Address

0xffffff813765b960 : 0xffffff802cede792

0xffffff813765b9e0 : 0xffffff802cfd155a

0xffffff813765bbc0 : 0xffffff802cfef233

0xffffff813765bbe0 : 0xffffff802cf86156

0xffffff813765bd00 : 0xffffff802cf503cd

0xffffff813765bf20 : 0xffffff802cfd1b4f

0xffffff813765bfb0 : 0xffffff802cfef145

BSD process name corresponding to current thread: Google Chrome He

Mac OS version:

15C50

Kernel version:

Darwin Kernel Version 15.2.0: Fri Nov 13 19:56:56 PST 2015; root:xnu-3248.20.55~2/RELEASE_X86_64

Kernel UUID: 17EA3101-D2E4-31BF-BDA9-931F51049F93

Kernel slide: 0x000000002cc00000

Kernel text base: 0xffffff802ce00000

__HIB text base: 0xffffff802cd00000

System model name: MacBookPro8,3 (Mac-942459F5819B171B)

System uptime in nanoseconds: 166470830699789

last loaded kext at 9580224222550: com.apple.filesystems.exfat 1.4 (addr 0xffffff7fb0a26000, size 65536)

last unloaded kext at 60724787188213: com.apple.filesystems.exfat 1.4 (addr 0xffffff7fb0a26000, size 57344)

loaded kexts:

org.virtualbox.kext.VBoxNetAdp 4.3.28

org.virtualbox.kext.VBoxNetFlt 4.3.28

org.virtualbox.kext.VBoxUSB 4.3.28

org.virtualbox.kext.VBoxDrv 4.3.28

com.Cycling74.driver.Soundflower 2

com.Logitech.Unifying.HID Driver 1.3.1

com.Logitech.Control Center.HID Driver 3.9.1

com.apple.filesystems.smbfs 3.0.0

com.apple.filesystems.cddafs 2.6.1

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AGPM 110.20.21

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleMikeyDriver 272.51.3

com.apple.driver.AppleHDA 272.51.3

com.apple.driver.AudioAUUC 1.70

com.apple.driver.pmtelemetry 1

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.iokit.IOBluetoothSerialManager 4.4.3f4

com.apple.kext.AMDFramebuffer 1.4.0

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleIntelHD3000Graphics 10.0.0

com.apple.AMDRadeonX3000 1.4.0

com.apple.driver.SMCMotionSensor 3.0.4d1

com.apple.driver.AppleHV 1

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleLPC 3.1

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.driver.AppleSMCLMU 208

com.apple.driver.AppleMuxControl 3.12.6

com.apple.kext.AMD6000Controller 1.4.0

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0

com.apple.driver.AppleThunderboltIP 3.0.8

com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0

com.apple.driver.AppleMCCSControl 1.2.13

com.apple.driver.AppleUSBTCButtons 245.4

com.apple.driver.AppleUSBTCKeyboard 245.4

com.apple.driver.AppleIRController 327.5

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.BootCache 38

com.apple.iokit.SCSITaskUserClient 3.7.7

com.apple.iokit.IOAHCIBlockStorage 2.8.5

com.apple.driver.AirPort.Brcm4331 800.20.24

com.apple.iokit.AppleBCM5701Ethernet 10.1.12

com.apple.driver.AppleFWOHCI 5.5.2

com.apple.driver.AppleAHCIPort 3.1.8

com.apple.driver.usb.AppleUSBEHCIPCI 1.0.1

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleACPIButtons 4.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 4.0

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 218.0.0

com.apple.nke.applicationfirewall 163

com.apple.security.quarantine 3

com.apple.security.TMSafetyNet 8

com.apple.driver.AppleIntelCPUPowerManagement 218.0.0

com.apple.iokit.IOUSBUserClient 900.4.1

com.apple.driver.AppleBluetoothHIDKeyboard 181

com.apple.driver.AppleHIDKeyboard 181

com.apple.kext.triggers 1.0

com.apple.driver.DspFuncLib 272.51.3

com.apple.kext.OSvKernDSPLib 525

com.apple.iokit.IOSurface 108.0.1

com.apple.iokit.IOSerialFamily 11

com.apple.driver.CoreCaptureResponder 1

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.iokit.IOAcceleratorFamily2 203.14

com.apple.driver.AppleHDAController 272.51.3

com.apple.iokit.IOHDAFamily 272.51.3

com.apple.iokit.IOAudioFamily 204.3

com.apple.vecLib.kext 1.2.0

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.3f4

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.driver.AppleGraphicsControl 3.12.6

com.apple.kext.AMDSupport 1.4.0

com.apple.AppleGraphicsDeviceControl 3.12.6

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d7

com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.AppleSMBusController 1.0.14d1

com.apple.iokit.IOGraphicsFamily 2.4.1

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7

com.apple.iokit.IOUSBMassStorageDriver 1.0.0

com.apple.driver.AppleUSBMultitouch 250.5

com.apple.driver.IOBluetoothHIDDriver 4.4.3f4

com.apple.iokit.IOBluetoothFamily 4.4.3f4

com.apple.iokit.IOUSBHIDDriver 900.4.1

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.0.1

com.apple.driver.usb.AppleUSBHub 1.0.1

com.apple.driver.CoreStorage 517.20.1

com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.7

com.apple.iokit.IOBDStorageFamily 1.8

com.apple.iokit.IODVDStorageFamily 1.8

com.apple.iokit.IOCDStorageFamily 1.8

com.apple.driver.AppleThunderboltDPInAdapter 4.1.3

com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.3

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.driver.AppleThunderboltNHI 4.0.4

com.apple.iokit.IOThunderboltFamily 5.1.0

com.apple.iokit.IOAHCISerialATAPI 2.6.2

com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.iokit.IO80211Family 1110.26

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IONetworkingFamily 3.2

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOFireWireFamily 4.5.8

com.apple.iokit.IOAHCIFamily 2.8.1

com.apple.driver.usb.AppleUSBEHCI 1.0.1

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.iokit.IOUSBHostFamily 1.0.1

com.apple.driver.AppleUSBHostMergeProperties 1.0.1

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 417.1

com.apple.iokit.IOStorageFamily 2.1

com.apple.iokit.IOReportFamily 31

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 4.0

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.pthread 1

com.apple.kec.Libm 1

com.apple.kec.corecrypto 1.0