HI Ak
Just some temporary network issue already resolved it as soon as i got V mail the issue is old arise because server runs out of memory sometimes processing database tasks we can increase server resources for that
Maybe upgrading to a 4GB ram server will be nice enough but as you would have noticed we faced same issue after lot of time because i already created swap memory on server that handles memory outages when system runs out of memory seems like some resource intensive task ran on serveer that crashed our DB server
I will keep a check on it
Thanks