Q: computer restarting and freezing randomly

my computer has been freezing and restarting randomly. my problems seem to have started a few weeks later after installing el capital, i've downgraded to Yosemite but still the same problems.

this is one of the logs that i got

Anonymous UUID:       C7EA6ED9-E5B1-E0A2-8007-306F258A357F

Thu Jan 14 11:49:51 2016

*** Panic Report ***

panic(cpu 0 caller 0xffffff8002dc127e): "launchd died\nState at Last Exception:\n\n"@/SourceCache/xnu/xnu-2782.40.9/bsd/kern/kern_exit.c:363

uuid info:

0x7fff612b5000 uuid = <b1b370a5-479f-3533-8ad7-97b687d4f989>

0x10876c000 uuid = <c0446878-e8d0-3461-a226-91ff1c2b2da6>

0x1087be000 uuid = <4396b358-725e-3ec0-bcbb-e4bf75fe1fb0>

RAX: 0x0000000002000001, RBX: 0x0000000000000006, RCX: 0x0000000108f540e8, RDX: 0x0000000000000000

RSP: 0x0000000108f540e8, RBP: 0x0000000108f54190, RSI: 0x0000000108f53f40, RDI: 0x0000000000000001

R8:  0x0000000000000000, R9:  0x00000001087ab9f0, R10: 0x00007fff8409bb02, R11: 0x0000000000000206

R12: 0x0000000000000000, R13: 0x00007fff880827e0, R14: 0x0000000108f545d0, R15: 0x0000000108f54790

RFL: 0x0000000000000206, RIP: 0x00007fff8409995a, CS:  0x0000000000000007, SS:  0x0000000000000023

Thread  0xffffff8013b77000

  0x00007fff868ebdab

  0x00007fff868ebec8

  0x00007fff868e53b4

  0x00007fff84081a6c

  0x000000010879a907

  0x00007fff8b743c13

  0x00007fff8b74688f

  0x00007fff8b754fe4

  0x00007fff8e224a9d

  0x00007fff8e2223dd

  0x0000000000000000

Thread  0xffffff8013b7ca78

  0x00007fff8b746a6a

  0x0000000000000000

Thread  0xffffff8013ce1970

  0x0000000108783c91

  0x00007fff8b743c13

  0x00007fff8b747365

  0x00007fff8b748ecc

  0x00007fff8b7466b7

  0x00007fff8b754fe4

  0x00007fff8e224a9d

  0x00007fff8e2223dd

  0x0000000000000000

Thread  0xffffff8013d45c50

  0x00007fff8b7543ad

  0x0000000000000000

Thread  0xffffff8015702798

  0x00007fff8e2223dd

  0x0000000000000000

Thread  0xffffff80142e12e0

  0x00007fff8b746468

  0x00007fff8e22505a

  0x00007fff8e224fd7

  0x00007fff8e2223ed

  0x0000000000000000

Thread  0xffffff8016e5fc50

  0x00007fff8bb03f1a

  0x0000000000000000

  0x00007fff612c1475

  0x00007fff90ac77b5

  0x00007fff868ba648

  0x00007fff880827e0

  0x00007fff88084ddf

  0x00007fff8b743c13

  0x00007fff8b744e5e

  0x00007fff880830a7

  0x0000000108797393

  0x00007fff8b743c13

  0x00007fff8b747365

  0x00007fff8b748ecc

  0x00007fff8b747154

  0x00007fff8b748ecc

  0x00007fff8b7466b7

  0x00007fff8b754fe4

  0x00007fff8e224a9d

  0x00007fff8e2223dd

  0x0000000000000000

Mac OS version: 14F27

Kernel version: Darwin Kernel Version 14.5.0: Wed Jul 29 02:26:53 PDT 2015; root:xnu-2782.40.9~1/RELEASE_X86_64

Kernel UUID: 58F06365-45C7-3CA7-B80D-173AFD1A03C4

System model name: MacBookPro5,4 (Mac-F22587A1)

Model: MacBookPro5,4, BootROM MBP53.00AC.B03, 2 processors, Intel Core 2 Duo, 2.53 GHz, 8 GB, SMC 1.49f2

Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x859B, 0x435435313236344243313036372E4D313646

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1067 MHz, 0x859B, 0x435435313236344243313036372E4D313646

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.24)

Bluetooth: Version 4.3.6f3 16238, 3 services, 19 devices, 1 incoming serial ports

Serial ATA Device: OCZ-SOLID3, 480.1 GB

Serial ATA Device: HL-DT-ST DVDRW  GS23NR

USB Device: Built-in iSight

USB Device: Internal Memory Card Reader

USB Device: Apple Internal Keyboard / Trackpad

USB Device: USB-Serial Controller

USB Device: IR Receiver

USB Device: BRCM2046 Hub

USB Device: Bluetooth USB Host Controller

Thunderbolt Bus: