Server randomly crashing with no trace of memory.dmp

Hey gents we have been experiencing several shutdown errors with our ESXI Host.   We have the companies FS/ DC running off this host I believe its 6.0.   Last night around 4 or 5PM EST The servers shut down again.   I have attached some event viewer logs.   Server OS is 2012 R2.   Now after the server went down it did not automatically reboot.   I checked for memory.dmp files and could not find any under the %systemroot% (I don't think they are hidden).   So I am wondering if its related to power.  Also looking at our Datto backup in place which stopped working 3 hours prior, looking at the meta data it showed a communication loss to one of the shared partitions on the server which was their E:\ volume where all their shares sit.     Here is the Meta Data Log.

Tue 23/04/19 1:01:02 pm - metrics {"name""HighlyRandomUnidentifiableMimetype","description""Detects file entries that contain a known extension, unidentifiable mimetype, and are highly random","result"false,"occurrences"0,"total"0,"percent"0,"threshold"0.05,"minimum_samples"20,"maximum_occurrences"9223372036854775807,"files"[]} 
Tue 23/04/19 1:01:02 pm - Rule "HighlyRandomUnidentifiableMimetype" did not detect ransomware. 0 out of 0 files checked showed signs of ransomware (0%%). 
Tue 23/04/19 1:01:02 pm - metrics {"name""KnownRansomwareExtensions","description""Detects file entries that contain a known ransomware extension","result"false,"occurrences"0,"total"0,"percent"0,"threshold"0.005,"minimum_samples"20,"maximum_occurrences"3,"files"[]} 
Tue 23/04/19 1:01:02 pm - Rule "KnownRansomwareExtensions" did not detect ransomware. 0 out of 0 files checked showed signs of ransomware (0%%). 

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There are various log files with this.   I do recall in the meta data that it showed corrupt volume on their E:\ which is where their shares are which they claimed were inaccessible as of yesterday.

Datto did something on their end, got the local and offsite backups to run which restored connectivity to the E:\ volume internally as well I am just unsure as to what they did.   However everything is backing up now as normal.    I am looking at the server logs and here is what they show.

The previous system shutdown at 1:40:21 PM on ‎4/‎22/‎2019 was unexpected.
Event 6008

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Kernel Power (I think it lost power)

The reason supplied by user CIRCUITCLINICAL\admin.del for the last unexpected shutdown of this computer is: Other (Unplanned)
 Reason Code: 0xa000000
 Problem ID: 
 Bugcheck String: 
 Comment:  Event ID 1076

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Since I was not there I can not tell if this was related to power or an application crash.   Any assistance would be greatly appreciated.   This has gone down 3 times so far this year.