Hi Hemanth,
All well...thanks 
That's the funny part !
This happens on servers where load is practically nil too !
Hence not sure what's causing the break...also, event viewer does not talk about any resource shortages.
Could this have something to do with the Diag. agent since that's installed on "all" SAP servers or some known issues with Symantec maybe ?
Thanks a ton !
saba.