We have the same problem, only our VCSA goes every evening down (vmware-vpxd service) We first have a other problem:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=200681...
This solved our problem, but now our database is running full.
After reboot there is some free space, but it will fill in one day.
I make a call with vmware to see if they can help me.