@syedshakir, Has any of the replies helped resolve your issue? If so, please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future. If you are still experiencing the issue, can you provide the information @asish has requested?
Issue resolved by increasing number of conection and session timeout as a workaround.
Actually need to use dedicated disk for DB's.
Thanks for the confirmation @syedshakir. Much appreciated.