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It was noted in the log several lines indicating AsyncCompletion delays. This is disk related. 01:12:42.042957 AsyncCompletion: Task 0x007f0767284200 completed after 30 seconds* System, Acceleration, change Default to None.* System, Acceleration, change Default to None ... didn't help* enable the Host I/O Cache in Storage > Controller: SATA. ... RESOLVED PROBLEM.