Iv got a problem that i cannot resolve (FreeBSD 9.2)

[Передерий Сергей]

Hello.
The problem happens when i install ant port
(for example cd /usr/ports/net/isc-dhcp42-server/
 make install clean)
 also problem appear when i do
 portsnap fetch update

 And problem is FreeBSD rebots during installation.
 Please help me resolve this problem.
 Yhank you.