Tasks in Task Scheduler remain "Enqueued"

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    I started to see this problem with tasks, which are not started automatically. Problem seems to get resolved for a short time by restarting Windows server.
    There is also long wait before loading the "Task Scheduler" page, sometimes throwing error:

    Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Toems_FrontEnd.views.admin.taskscheduler.PopulateForm() +1337
   Toems_FrontEnd.views.admin.taskscheduler.Page_Load(Object sender, EventArgs e) +111
   System.Web.UI.Control.OnLoad(EventArgs e) +107
   System.Web.UI.Control.LoadRecursive() +89
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4718.0
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