"Job ... Stopped due to unexpected process termination" error

Job "JobName" stopped due to unexpected process termination.

Verify the Execution Logs from the Bot machine where you received the error. 
In the execution logs, check for logging level. If the logging level is set to VERBOSE then it is expected to have the above error. 

Change the Logging level from Verbose to Info in the Robot tray. 
If the above doesn't work then change here. 

 
C:\Program Files (x86)\UiPath\Studio – NLOG.config file 
<!-- VisionHost tracing -->
<logger name="UiPath.Vision.Host.exe" minLevel="Warn" writeTo="visionHostFile" final="true" /> 
<logger name="Internal" minLevel="Trace" writeTo="eventLog" />
<logger name="Execution" minLevel="Info" writeTo="executionFile" final="true" />
</rules>
</nlog> 

NOTES:

  1. This happens when there are lot of LOGS generated; [*This is one of the reason for unexpected process termination]
  2. Applicable to all versions