Yosemite - random crashes and restarts

Hi since I have installed Yosemite. My computer is mysteriously restarting and recovering from a crash. It never happens while I am using the computer but I can come home from work or from being away from home and I find that the computer has restarted and that it gives me recovery info upon restart. Here is the error log that shows up when I restart.

Can anyone look at this and tell me what is going on or what is at the bottom of it.

The computer is iMac 27-inch Mid 2011

3.1 Ghz Intel Core i5

20GB 1333 MHz DDR3

AMD Radeon HD 6970M 1024 MB

475 GB free storage on main disk.

Anonymous UUID: 4A84C5C6-86FB-AE96-09EC-EFEDBD5936E4

Sun Oct 19 00:04:54 2014

*** Panic Report ***

panic(cpu 3 caller 0xffffff800801e80a): Kernel trap at 0xffffff7f8866c62d, type 14=page fault, registers:

CR0: 0x0000000080010033, CR2: 0x0000000000000078, CR3: 0x000000053844f035, CR4: 0x00000000000626e0

RAX: 0x0000000002000264, RBX: 0x0000000000000000, RCX: 0x000000000000004b, RDX: 0x0000000000000021

RSP: 0xffffff82602ab2d0, RBP: 0xffffff82602ab2e0, RSI: 0xffffff8038807b50, RDI: 0x0000000000000000

R8: 0xffffff8031ca5408, R9: 0xfffffffffffff000, R10: 0x0000000007fc01c4, R11: 0x00000000f06e754f

R12: 0xffffff8038807b50, R13: 0xffffff820eed0a48, R14: 0xffffff8038807b50, R15: 0xffffff8038807808

RFL: 0x0000000000010246, RIP: 0xffffff7f8866c62d, CS: 0x0000000000000008, SS: 0x0000000000000010

Fault CR2: 0x0000000000000078, Error code: 0x0000000000000002, Fault CPU: 0x3

Backtrace (CPU 3), Frame : Return Address

0xffffff82602aaf80 : 0xffffff8007f3a811

0xffffff82602ab000 : 0xffffff800801e80a

0xffffff82602ab1c0 : 0xffffff800803a443

0xffffff82602ab1e0 : 0xffffff7f8866c62d

0xffffff82602ab2e0 : 0xffffff7f8866920e

0xffffff82602ab320 : 0xffffff7f88665548

0xffffff82602ab370 : 0xffffff7f88664c68

0xffffff82602ab3d0 : 0xffffff7f88669cf5

0xffffff82602ab410 : 0xffffff7f8866969e

0xffffff82602ab470 : 0xffffff7f886656d0

0xffffff82602ab4d0 : 0xffffff7f886648fa

0xffffff82602ab510 : 0xffffff7f886629d0

0xffffff82602ab560 : 0xffffff7f88660637

0xffffff82602ab7a0 : 0xffffff7f8865b9ef

0xffffff82602ab830 : 0xffffff7f8864201b

0xffffff82602ab860 : 0xffffff800827731b

0xffffff82602abbe0 : 0xffffff80082980db

0xffffff82602abcf0 : 0xffffff8008417740

0xffffff82602abde0 : 0xffffff8008429654

0xffffff82602abee0 : 0xffffff800842641b

0xffffff82602abf50 : 0xffffff800844dcb2

0xffffff82602abfb0 : 0xffffff800803ac46

Kernel Extensions in backtrace:

com.symantec.kext.internetSecurity(5.4f4)[77BF0BC5-BEF4-34FF-9160-C22D470BB3B2] @0xffffff7f88639000->0xffffff7f88647fff

com.symantec.kext.ips(3.9.2f1)[70330C8B-669A-35A8-A7DD-9E428BE89B9F]@0xffffff7f 88658000->0xffffff7f886b0fff

dependency: com.symantec.kext.internetSecurity(5.4f4)[77BF0BC5-BEF4-34FF-9160-C22D470BB3B2] @0xffffff7f88639000

BSD process name corresponding to current thread: discoveryd

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: 0x0000000007c00000

Kernel text base: 0xffffff8007e00000

__HIB text base: 0xffffff8007d00000

System model name: iMac12,2 (Mac-942B59F58194171B)

System uptime in nanoseconds: 53451029788159

last loaded kext at 6764999226097: com.parallels.kext.vnic 10.0.2 27712 (addr 0xffffff7f8ad07000, size 32768)

last unloaded kext at 329853869218: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f8ac4d000, size 61440)

loaded kexts:

com.parallels.kext.vnic 10.0.2 27712

com.parallels.kext.netbridge 10.0.2 27712

com.parallels.kext.hypervisor 10.0.2 27712

com.parallels.kext.usbconnect 10.0.2 27712

com.symantec.kext.SymAPComm 12.7.1f4

com.paragon-software.filesystems.ntfs 443.2.11

com.symantec.kext.fw 5.3.1f4

com.hzsystems.terminus.driver 4

com.seagate.driver.PowSecLeafDriver_10_5 5.2.6

com.symantec.kext.ips 3.9.2f1

com.symantec.kext.pf 5.7.1f4

com.symantec.kext.internetSecurity 5.4f4

com.seagate.driver.PowSecDriverCore 5.2.6

com.apple.filesystems.smbfs 3.0.0

com.apple.filesystems.exfat 1.4

com.apple.driver.AudioAUUC 1.70

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AGPM 100.14.37

com.apple.driver.AppleBluetoothMultitouch 85.3

com.apple.filesystems.autofs 3.0

com.apple.iokit.IOBluetoothSerialManager 4.3.0f10

com.apple.driver.AppleOSXWatchdog 1

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleMikeyDriver 266.5

com.apple.driver.AppleHDA 266.5

com.apple.iokit.IOUserEthernet 1.0.1

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10

com.apple.driver.AppleHWAccess 1

com.apple.driver.AppleHV 1

com.apple.driver.AppleLPC 1.7.3

com.apple.driver.AppleUpstreamUserClient 3.6.1

com.apple.driver.AppleThunderboltIP 2.0.2

com.apple.kext.AMDFramebuffer 1.2.8

com.apple.driver.AppleSMCPDRC 1.0.0

com.apple.driver.AppleSMCLMU 2.0.4d1

com.apple.AMDRadeonX3000 1.2.8

com.apple.kext.AMD6000Controller 1.2.8

com.apple.driver.AppleIntelHD3000Graphics 10.0.0

com.apple.driver.AppleIntelSNBGraphicsFB 10.0.0

com.apple.driver.AppleBacklight 170.4.12

com.apple.driver.AppleMCCSControl 1.2.10

com.apple.iokit.IOUSBAttachedSCSI 1.1.0

com.apple.iokit.SCSITaskUserClient 3.7.0

com.apple.driver.AppleUSBCardReader 3.5.0

com.apple.driver.AppleIRController 327.5

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 35

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.6.5

com.apple.driver.AppleUSBXHCI 705.4.14

com.apple.driver.AppleUSBHub 705.4.1

com.apple.iokit.AppleBCM5701Ethernet 10.1.2b3

com.apple.driver.AirPort.Atheros40 700.74.5

com.apple.driver.AppleFWOHCI 5.5.2

com.apple.driver.AppleAHCIPort 3.0.7

com.apple.driver.AppleUSBEHCI 705.4.14

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleACPIButtons 3.1

com.apple.driver.AppleRTC 2.0

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.driver.AppleMultitouchDriver 260.30

com.apple.kext.triggers 1.0

com.apple.driver.AppleBluetoothHIDKeyboard 175.5

com.apple.driver.IOBluetoothHIDDriver 4.3.0f10

com.apple.driver.AppleHIDKeyboard 175.5

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.IOPlatformPluginLegacy 1.0.0

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10

com.apple.iokit.IOBluetoothFamily 4.3.0f10

com.apple.driver.AppleSMBusPCI 1.0.12d1

com.apple.driver.AppleThunderboltEDMSink 4.0.2

com.apple.driver.IOPlatformPluginFamily 5.8.0d49

com.apple.iokit.IOUSBUserClient 705.4.0

com.apple.iokit.IOFireWireIP 2.2.6

com.apple.driver.AppleSMC 3.1.9

com.apple.driver.AppleHDAController 266.5

com.apple.iokit.IOHDAFamily 266.5

com.apple.iokit.IOAcceleratorFamily2 156.4

com.apple.kext.AMDSupport 1.2.8

com.apple.AppleGraphicsDeviceControl 3.7.21

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 2.4.1

com.apple.driver.AppleSMBusController 1.0.13d1

com.apple.iokit.IOGraphicsFamily 2.4.1

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.iokit.IOAHCISerialATAPI 2.6.1

com.apple.iokit.IOUSBMassStorageClass 3.7.0

com.apple.iokit.IOUSBHIDDriver 705.4.0

com.apple.driver.AppleThunderboltDPInAdapter 4.0.6

com.apple.driver.AppleThunderboltDPOutAdapter 4.0.6

com.apple.driver.AppleThunderboltDPAdapterFamily 4.0.6

com.apple.driver.AppleThunderboltPCIUpAdapter 2.0.2

com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2

com.apple.driver.AppleUSBMergeNub 705.4.0

com.apple.driver.AppleUSBComposite 705.4.9

com.apple.iokit.IOFireWireSBP2 4.2.5

com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.0

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.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IO80211Family 700.52

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.pthread 1

com.apple.kec.corecrypto 1.0

com.apple.kec.Libm 1