So the problem is it is creating some temp files whenever the extract refresh is happening.
Suggestion : try to write a script so that it will empty the following temp folder so that the you may not have this problem. by default tableau will remove these files every 24 hours. if you want you can set teh time for doing this. if You want to do it a script program might help you in doing this.
Dear THARASHASANK - Thanks for your response. Here the issue is, none of the dashboard can be opened at a certain point of time. I have raised a Production Severity 2 Ticket with Tableau and currently intouch with them. If they found any Tableau Bug / flaw I will definitely provide the update to the Community.