Autoreboot system - disk writes error

Hi all.

After sometime working very well and stable, now reboots are happening again.

I have mainly two diag errors pointing to:

DOCK:

Date/Time: 2017-12-15 08:01:07.335541 +0100

OS Version: Mac OS X 10.12.6 (Build 16G1036)

Architecture: x86_64

Report Version: 19

Command: Dock

Path: /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock

Version: 1.8 (1738.15)

Build Version: 1

Project Name: Dock

Source Version: 1738015000000000

Bundle Id: com.apple.Dock.agent

PID: 563

Coalition ID: 371

Wall Time Alive: 4

Footprint: 0MB

Limit: 200

Process Flags: Active

Event: memory high watermark

Action taken: none -- this exception is advisory

Duration: 7.69s

Steps: 0

Hardware model: iMac17,1

Active cpus: 4

Signature: CG raster data,app-specific tag 252,MALLOC_LARGE_REUSED,LayerKit

MallocStack Sig:

...

DISK WRITES:

Date/Time: 2018-01-12 12:00:00 +0100

OS Version: Mac OS X 10.12.6 (Build 16G1036)

Architecture: x86_64

Report Version: 19

Event: disk writes

Signature: com.apple.SystemStats.Daily.IO

Start time: 2018-01-12 12:00:00 +0100

End time: 2018-01-13 12:00:00 +0100

Duration: 86400s

Steps: 27104 (10.5 MB/step)

Hardware model: iMac17,1

Active cpus: 4

Binary Images:

1 com.apple.CoreServicesInternal 276.2 (276.2) <05EB7D45-DD4C-3A0F-AC63-A0C2A68E6481> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/Versions/A/Cor eServicesInternal

2 com.apple.CoreServices.CarbonCore 1159.6 (1159.6) <08AC074C-965B-3EDF-8E45-0707C8DE9EAD> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonC ore.framework/Versions/A/CarbonCore

3 <0943B1F3-2AD4-35E8-AAD8-E0138A8F5C36>

4 libsystem_asl.dylib (349.50.5) <096E4228-3B7C-30A6-8B13-EC909A64499A> /usr/lib/system/libsystem_asl.dylib

5 com.apple.CoreFoundation 6.9 (1349.8) <09ED473E-5DE8-307F-B55C-16F6419236D5> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation

6 <0AC314B8-C89C-3912-8BB7-E3F92C847169>

7 <0B21173C-512B-38C7-8968-0F11B755A24F>

8 libc++.1.dylib (307.5) <0B43BB5D-E6EB-3464-8DE9-B41AC8ED9D1C> /usr/lib/libc++.1.dylib

9 com.apple.bom 14.0 (194.1) <0CBECAF1-B5E0-302F-99EC-D7ED14E12B84> /System/Library/PrivateFrameworks/Bom.framework/Versions/A/Bom

10 <0EAFB1E4-7D3B-3122-AF64-2CD36B4CAA26>

Since MacOSX auto repair/fix disk permissions, I'm not sure to do this manually using Onyx for example.

Also before reboot at 0:05 hours, I see in console this four errors related to com.apple.trust.root:

OSActivityID: 0x800000000000ddd7

com.apple.message.domain: com.apple.trust.root

com.apple.message.signature: 925A8F8D

com.apple.message.summarize: YES
SenderMachUUID: 5BA7254D-0DD4-3426-B413-7939AD27153E

OSActivityID: 0x800000000000ddd8

com.apple.message.domain: com.apple.trust.root

com.apple.message.signature: 925A8F8D

com.apple.message.summarize: YES

SenderMachUUID: 5BA7254D-0DD4-3426-B413-7939AD27153E

OSActivityID: 0x800000000000ddd9

com.apple.message.domain: com.apple.trust.root

com.apple.message.signature: 925A8F8D

com.apple.message.summarize: YES

SenderMachUUID: 5BA7254D-0DD4-3426-B413-7939AD27153E

OSActivityID: 0x800000000000ddda

com.apple.message.domain: com.apple.trust.root

com.apple.message.signature: 925A8F8D

com.apple.message.summarize: YES

SenderMachUUID: 5BA7254D-0DD4-3426-B413-7939AD27153E

So, what can I do? By now I can't reinstall the OS (I would do in christmas holidays)... : |

Any help is appreciated.