Poking around on Google, it sounds like you aren’t the only one who ran into that… but the issue seems “intermittent”.
Looking at how rpc.statd obtains what port to listen on, it receives that from portmap. But there isn’t a standard port that’s used. So it sounds like portmap is capable of giving out a port to rpc.statd that’s used by other daemons.
If you were to reboot (or just restart portmap and rpc.statd), the problem may go away. Or, if you aren’t using NFS, you could always disable portmap and rpc.statd altogether.