fileserver locking up

[Brent Johnson]

Hello,

I'm running a cell with fileservers and db servers running solaris 2.6
and afs v. 3.5 345.  Every since we upgraded to 3.5 (about nine months
ago) we've been getting erratic behavior from our fileservers: vos
commands timeout regularly (every weekday, next to never on weekends or
after 7pm) with "possible communication failure", at least one (9 total)
of the fileservers dumps core. Here recently the fileserver and
volserver processes just hung--wouldn't take process any commands,
rxdebug failed, snoop showed no outbound traffic from volserver or
fileserver, disk usage was nil, and netstat -s output showed
udpInOverflows and udpNoPorts increasing.

This every happen to anybody else?

-Brent