Imac 2019 spegnimento improvviso

[clalop1974]

Buongiorno a tutti, da una settimana sono possessore di un iMac da 27 pollici, finora tutto benissimo visto che provengo da un Mac mini del 2011, tutto un altro pianeta in termini di velocità (utilizzo in particolare Lightroom e Final cut).
Questa mattina improvvisamente si è spento per poi riattivarsi, nel riattivarsi è comparsa per pochi secondi una finestra nera in cui era scritto in varie lingue che il Mac si era spento per un problema, purtroppo non ho fatto in tempo a fotografarla.
Ho letto altre discussioni qui nel sito e ho capito che occorre postare le 30 righe antecedenti al BOOT_TIME nel system.log:

Jul 3 09:57:15 iMac-di-lorenzo com.apple.xpc.launchd[1] (com.apple.mdworker.shared.08000000-0000-0000-0000-000000000000[10141]): Service exited due to SIGKILL | sent by mds[117]
Jul 3 09:58:50 iMac-di-lorenzo com.apple.xpc.launchd[1] (com.apple.mdworker.shared.07000000-0700-0000-0000-000000000000[10142]): Service exited due to SIGKILL | sent by mds[117]
Jul 3 09:59:02 iMac-di-lorenzo com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.user.501): Service "com.apple.xpc.launchd.unmanaged.loginwindow.164" tried to register for endpoint "com.apple.tsm.uiserver" already registered by owner: com.apple.TextInputMenuAgent
Jul 3 09:59:22 --- last message repeated 1 time ---
Jul 3 09:59:22 iMac-di-lorenzo syslogd[92]: ASL Sender Statistics
Jul 3 09:59:40 iMac-di-lorenzo com.apple.xpc.launchd[1] (com.apple.mdworker.shared.07000000-0000-0000-0000-000000000000[10143]): Service exited due to SIGKILL | sent by mds[117]
Jul 3 10:00:19 iMac-di-lorenzo com.apple.xpc.launchd[1] (com.apple.mdworker.shared.07000000-0100-0000-0000-000000000000[10144]): Service exited due to SIGKILL | sent by mds[117]
Jul 3 10:02:56 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:02:56 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:03:38 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:03:38 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:03:39 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch
client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:03:39 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:13 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:13 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:14 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:14 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:29 iMac-di-lorenzo bluetoothd[148]: notify name "com.apple.bluetooth.sensorTracking.stateChanged" has been registered 500 times - this may be a leak
Jul 3 10:04:55 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:55 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:56 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing the target of a source after it has been activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:04:56 iMac-di-lorenzo VTDecoderXPCService[10146]: DEPRECATED USE in libdispatch client: Changing target queue hierarchy after xpc connection was activated; set a breakpoint on _dispatch_bug_deprecated to debug
Jul 3 10:05:57 localhost bootlog[0]: BOOT_TIME 1593763557 0

qualche anima gentile ha modo di potermi aiutare a capire quello che è successo? E' capitato solo ora da quando l'ho acquistato una settimana fa, a parte se fosse successo quando non ero presente, ma a memoria ho sempre ritrovato il Mac come lo avevo lasciato, sono pero' preoccupato in quanto ho letto anche qui sul forum che e' un problema abbastanza diffuso,
grazie ancora per il prezioso aiuto

Lorenzo