스팀 맥북 프로 오류

맥북 프로, 2015년 형 레티나 15인치 제품을 쓰고 있습니다. 최근 스팀을 키면 자주 오류가 발생해 "Your Computer Restarted Because of a Problem" 이 뜨면서 꺼졌다 켜지거나, 아예 X표시가 뜨면서 꺼지는 경우가 있었습니다. 그래서 디스크 유틸리티에서 검사/복구도 해보고, 백업한 후 디스크를 삭제하고 OS X를 시에라 10.12.6 버전으로 다시 깔았습니다. 그런데 전부 삭제하고 백업된 필수 프로그램만 재설치해서 17GB정도 사용하고 103GB정도 남았는데, 다시 스팀을 키니까 "Your Computer Restarted Because of a Problem"이 뜨고 재시작 했습니다. 리포트는 아래와 같이 나옵니다. 컴퓨터를 잘 모르는데 무엇이 문제인가요?

Anonymous UUID: 8B02AACE-4770-AFC2-1F16-D5A40518D4C4

Wed Jul 26 05:22:26 2017

*** Panic Report ***

panic(cpu 3 caller 0xffffff800b76b46f): initproc exited -- exit reason namespace 2 subcode 0xb description: none

uuid info:

0x109f9f000 uuid = <322c06b7-8878-311d-888c-c8fd2ca96ff3>

0x1083db000 uuid = <0ac314b8-c89c-3912-8bb7-e3f92c847169>

Thread 2 crashed

RAX: 0x0000000002000170, RBX: 0x000000004000765f, RCX: 0x0000700002518b80, RDX: 0x0000700002499000

RSP: 0x0000700002518b00, RBP: 0x0000000000000000, RSI: 0x000000000007fa73, RDI: 0x0000700002519001

R8: 0x00000000002e0019, R9: 0x0000000000000001, R10: 0x0000000000000000, R11: 0x0000000000000246

R12: 0x00000000800004ff, R13: 0x0000700002519000, R14: 0x0000000080000000, R15: 0x000000000007fa73

RFL: 0x0000000000010202, RIP: 0x00007fffccae5073, CS: 0x000000000000002b, SS: 0x0000000000000023

Thread 0: 0xffffff801e34b000

0x00007fffcc9fb1e6

0x00007fffcc8a424f

0x0000000000000000

Thread 1: 0xffffff801e0d2510

0x00007fffcc9f3386

0x00007fffcc89f891

0x00000001083f4cc5

0x00007fffcc8968fc

0x00007fffcc8ac9a0

0x00007fffcc89f306

0x00007fffcc8a5020

0x00007fffcc8986b5

0x00007fffcc89848c

0x00007fffccae55a2

0x00007fffccae507d

0x0000000000000000

Thread 2: 0xffffff8022601028

0x00007fffccae5073

Thread 3: 0xffffff801f750000

0x00007fffccae5070

Thread 4: 0xffffff801f1b9028

0x00007fffccae5070

Thread 5: 0xffffff801f1b94c0

0x0000000000000000

Mac OS version:

16G29

Kernel version:

Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64

Kernel UUID: D3314D98-5D40-3CD8-98A4-F1DD46C20E03

System model name: MacBookPro12,1 (Mac-E43C1C25D4880AD6)

Model: MacBookPro12,1, BootROM MBP121.0167.B33, 2 processors, Intel Core i5, 2.7 GHz, 8 GB, SMC 2.28f7

Graphics: Intel Iris Graphics 6100, Intel Iris Graphics 6100, Built-In

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1867 MHz, 0x80AD, 0x483943434E4E4E424C54414C41522D4E5544

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1867 MHz, 0x80AD, 0x483943434E4E4E424C54414C41522D4E5544

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x133), Broadcom BCM43xx 1.0 (7.21.171.130.1a1)

Bluetooth: Version 5.0.5f1, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en0

Serial ATA Device: APPLE SSD SM0128G, 121.33 GB

USB Device: USB 3.0 Bus

USB Device: Bluetooth USB Host Controller

Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1