Seems like your SQL Server instance produces stack dumps ever so often.
Just remove those *.mdmp files.. Next, install Service Pack2 for SQL Server 2016 and also apply the most recent Cumulative Update. You are way behind on updates, so it is not of interest why get these crashes. Rhey may very have been resolved in later builds.
Would the .mdmp files reappear, it is time to take a closer look.