Have you searched here on these forums? Have you looked at the logs for yourself to see what they say?
What is the VC version and build ?
df -h status ?
Also share the vpxd logs status .
Is there a core/dump created under /storage/core after the vpxd stops ?
Do you check vcenter logs ?
Logs will help you. You can try to install vcenter latest patches.
Yes I upgraded the vCenter but it didn't work. checked logs also.. luckily we took snapshot last night so, we restored the snapshot. now its up and running now. .. Thank you for looking into this..