In my experience on a similar configuration, most of the times such aliens is because of i/o bottleneck. Antivirus, Windows app optimisations, and device manuf

In my experience on a similar configuration, most of the times such aliens is because of i/o bottleneck. Antivirus, Windows app optimisations, and device manufacturers' softwares running at predefined schedules, choking the disk might be a problem. You frontotemporal should check the process explorer next time you gave the issue. In the meantime, may be check the task scheduler to see if some heavy read write tasks are scheduled