commit issue with queued task

Hello, We have a very long process (microflow) to do in our application.  we are calling that microflow using queued task with thread number 2. Everything works fine when the process is not too long. But When the duration is more than 6000 second the application seems to not work anymore for other users, using the debugger we see that some commit of object are ""waiting” for the long microflow to finish (we can also see them in the running now tab in the metrics). Nothing appear in the log (no error), and the metrics seems fine.  any help will be appreciated. 
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