What are the reasons for the agent to be active (but not running)?

Question

1C-Bitrix

Please tell me what are the reasons that the agent is active, but not running (does not write to the log), then after a while it deactivates itself.
that is, it works, it works, then once it is deactivated ... (agent on the crown)

Look, I put down an entry in the logs:
I see the following

public static function Start(){
   
    AddMessage2Log("18", "module");
    try {
        AddMessage2Log( date("d.m.Y H:i:s")."BEfore new MsService()", "module");
        $myImport = new MsSer();
        AddMessage2Log( date("d.m.Y H:i:s")."new MsSer()", "module");

        $myImport->__destruct();
        AddMessage2Log("__destruct()", "module");
    }
    catch (SystemException $exception)
    {
        AddMessage2Log( date("d.m.Y H:i:s")."BEfore SystemException", "module");
     
        AddMessage2Log("SystemException", "module");
    }
    AddMessage2Log(date("d.m.Y H:i:s")."before return", "module");

    return 'MsAgent::Start();';
}

everything is trampled for half an hour with AddMessage2Log("18", "module"), cron every 10 minutes, it doesn't go any further... then it suddenly breaks further...try.

Date: 2020-07-25 07:25:00
Module: module
18
Date: 2020-07-25 07:35:02
Module: module
18
Date: 2020-07-25 07:45:01
Module: module
18

and then went below try....

Answer 1

The agent function crashes with an error under some conditions.