If your Windows domain controllers have been crashing since a security update was installed earlier this month, there's no longer any need to speculate why: Microsoft has admitted it introduced a memory leak in its March patches and fixed the issue.
Extreme memory leaks may cause LSASS to crash, which triggers an unscheduled reboot of underlying domain controllers. Until you install that fix, the only way to prevent a domain controller from crashing is to monitor its memory usage and keep an eye out for leaks.
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