Hi Kaushal Malavia,
I think the problem you are facing is due to memory overwriting. But not so sure that it is the exact reason because this could happen due to several reasons.
And, you should generally use the latest kernel patch from SAP Service Marketplace, since several of the problems are due to kernel errors.
So, you must go through this following post which contains the several another reasons of this query.
Read more on:
http://www.saptechies.org/work-processes-used-user-sapsys/
Hope this will help you.
Thank You,
Sonia Barwar.