Restrict it to something like 8GB(based on your requirement) and restart SQL Services.Hope this helps ! ------------------------------------------------------Please Mark This As Answer if it solved your issue. Please Vote This As Helpful if it helps to solve your issue
I have a contradictory view here. 8G IMO is less even I dont know what all services and application are running on system but if this is dedicated system atleast 11-12G should be given to SQL Server.
Plus you dont need to restart SQl server services after changing max server memory setting
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