Thanks for your reply, Bill.
The same file is running fine in production. Ofcourse, Dev is having less RAM memory compared to production.
But when i check the memory consumption during this issue, it occupies 40 - 60 %. This seems to be normal.
One more issue happened today. Sometimes we are getting "Two or more services are down" error(QVWS and DSC) . later it is automatically getting reconnected.