rpc-statd.service from nfs-utils-1.3.4 depends on rpcbind.socket. The latter is provided by net-nds/rpcbind-0.2.4. So please either adjust dependencies or add rpcbind.socket to ~net-nds/rpcbind-0.2.3 ebuild (if this will help to stabilize nfs-utils-1.3.4 faster).
commit b97f9aca10c1d7963e1f19b07235fa7841cee3fd Author: Lars Wendler <polynomial-c@gentoo.org> Date: Mon Feb 20 08:53:48 2017 net-fs/nfs-utils: Adjusted dependency on net-nds/rpcbind (bug #610048). Package-Manager: Portage-2.3.3, Repoman-2.3.1