Computer randomly rebooting itself

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So my computer decides it likes randomly rebooting itself. not in the manner of a tyyopical KP either and on reboot even there is never the black screen with the message. As I normally need the use of it and reboot straigt away it has been a hassleto try and identify the timeline and code in console up til now but this timeit rebooted while I clept and I effectively (Woke from sleep to a rebooted machine....

Here is some code from around the time of the reboot. I'm hoping some wise owl can identify this and help fix what is causing this. Thanks in advance

Dec 28 07:09:37 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Dec 28 07:09:40 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a23d420d[689]): Service exited with abnormal code: 111
Dec 28 07:09:45 Ethelreds-iMac-Pro loginwindow[104]: There are still active callers
Dec 28 07:09:46 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.WebKit.Networking.B6AAE909-3724-48FD-B76A-B41975AE03F1[822]): Service exited with abnormal code: 1
Dec 28 07:09:46 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.WebKit.Networking.4A6348BA-D745-47F9-9ADE-F4FB20B9BE0D[823]): Service exited with abnormal code: 1
Dec 28 07:10:00 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:2
Dec 28 07:10:00 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:2
Dec 28 07:10:00 Ethelreds-iMac-Pro iTunes[377]: tid:21513 - Mux ID not found in mapping dictionary
Dec 28 07:10:00 Ethelreds-iMac-Pro iTunes[377]: tid:21513 - Can't handle disconnect with invalid ecid
Dec 28 07:10:18 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.mdworker.shared.0E000000-0000-0000-0000-000000000000): Service only ran for 2 seconds. Pushing respawn out by 8 seconds.
Dec 28 07:10:21 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Dec 28 07:10:24 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:3
Dec 28 07:10:24 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:3
Dec 28 07:10:24 Ethelreds-iMac-Pro iTunes[377]: tid:1ef13 - Mux ID not found in mapping dictionary
Dec 28 07:10:24 Ethelreds-iMac-Pro iTunes[377]: tid:1ef13 - Can't handle disconnect with invalid ecid
Dec 28 07:10:26 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.user.501): Preventing "com.apple.passd" from registering for com.apple.passd.usage due to non-launching property mismatch
Dec 28 07:10:26 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.passd[867]): The endpoint "com.apple.passd.usage" defined in plist already exists and is owned by: com.apple.passd
Dec 28 07:10:26 Ethelreds-iMac-Pro xpcproxy[868]: libcoreservices: _dirhelper_userdir: 529: bootstrap_look_up returned (ipc/send) invalid destination port
Dec 28 07:11:18 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:4
Dec 28 07:11:18 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:4
Dec 28 07:11:18 Ethelreds-iMac-Pro iTunes[377]: tid:1ef1b - Mux ID not found in mapping dictionary
Dec 28 07:11:18 Ethelreds-iMac-Pro iTunes[377]: tid:1ef1b - Can't handle disconnect with invalid ecid
Dec 28 07:12:10 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:5
Dec 28 07:12:10 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:5
Dec 28 07:12:10 Ethelreds-iMac-Pro iTunes[377]: tid:1de27 - Mux ID not found in mapping dictionary
Dec 28 07:12:10 Ethelreds-iMac-Pro iTunes[377]: tid:1de27 - Can't handle disconnect with invalid ecid
Dec 28 07:12:27 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Dec 28 07:13:19 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:6
Dec 28 07:13:19 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:6
Dec 28 07:13:19 Ethelreds-iMac-Pro iTunes[377]: tid:21d2f - Mux ID not found in mapping dictionary
Dec 28 07:13:19 Ethelreds-iMac-Pro iTunes[377]: tid:21d2f - Can't handle disconnect with invalid ecid
Dec 28 07:13:22 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Dec 28 07:14:20 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:7
Dec 28 07:14:20 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:7
Dec 28 07:14:20 Ethelreds-iMac-Pro iTunes[377]: tid:187bb - Mux ID not found in mapping dictionary
Dec 28 07:14:20 Ethelreds-iMac-Pro iTunes[377]: tid:187bb - Can't handle disconnect with invalid ecid
Dec 28 07:15:07 Ethelreds-iMac-Pro appstoreagent[886]: objc[886]: Class ASDPurchaseResult is implemented in both /System/Library/PrivateFrameworks/AppStoreDaemon.framework/Versions/A/AppStoreDaemon (0x7fff916fed78) and /System/Library/PrivateFrameworks/AppStoreDaemon.framework/Support/appstoreagent (0x107dab480). One of the two will be used. Which one is undefined.
Dec 28 07:15:43 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:8
Dec 28 07:15:43 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:8
Dec 28 07:15:43 Ethelreds-iMac-Pro iTunes[377]: tid:3685f - Mux ID not found in mapping dictionary
Dec 28 07:15:43 Ethelreds-iMac-Pro iTunes[377]: tid:3685f - Can't handle disconnect with invalid ecid
Dec 28 07:16:33 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:9
Dec 28 07:16:33 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:9
Dec 28 07:16:33 Ethelreds-iMac-Pro iTunes[377]: tid:4e5b - Mux ID not found in mapping dictionary
Dec 28 07:16:33 Ethelreds-iMac-Pro iTunes[377]: tid:4e5b - Can't handle disconnect with invalid ecid
Dec 28 07:17:23 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:10
Dec 28 07:17:23 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:10
Dec 28 07:17:23 Ethelreds-iMac-Pro iTunes[377]: tid:21d03 - Mux ID not found in mapping dictionary
Dec 28 07:17:23 Ethelreds-iMac-Pro iTunes[377]: tid:21d03 - Can't handle disconnect with invalid ecid
Dec 28 07:18:07 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:11
Dec 28 07:18:07 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:11
Dec 28 07:18:07 Ethelreds-iMac-Pro iTunes[377]: tid:3403 - Mux ID not found in mapping dictionary
Dec 28 07:18:07 Ethelreds-iMac-Pro iTunes[377]: tid:3403 - Can't handle disconnect with invalid ecid
Dec 28 07:18:29 Ethelreds-iMac-Pro syslogd[45]: ASL Sender Statistics
Dec 28 07:18:29 Ethelreds-iMac-Pro iTunes[377]: Entered:_AMMuxedDeviceDisconnected, mux-device:12
Dec 28 07:18:29 Ethelreds-iMac-Pro iTunes[377]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:12
Dec 28 07:18:29 Ethelreds-iMac-Pro iTunes[377]: tid:3403 - Mux ID not found in mapping dictionary
Dec 28 07:18:29 Ethelreds-iMac-Pro iTunes[377]: tid:3403 - Can't handle disconnect with invalid ecid
Dec 28 07:18:29 Ethelreds-iMac-Pro loginwindow[104]: DEPRECATED USE in libdispatch client: dispatch source activated with no event handler set; set a breakpoint on _dispatch_bug_deprecated to debug
Dec 28 07:18:29 Ethelreds-iMac-Pro com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.user.501): Service "com.apple.xpc.launchd.unmanaged.loginwindow.104" tried to register for endpoint "com.apple.tsm.uiserver" already registered by owner: com.apple.SystemUIServer.agent

 

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anybody?