migrate user home from Solaris to RHEL 3AS

We have a RHEL 3AS that is mysteriously crashing with no decernable
pattern. It was withstood VERY high memory/CPU load with no issue, but
then has crashed with no users logged in (hence very low load). The
machine will stay up for about 3-4 days then lock completely (nothing
in logs, can't even netdump), however it will respond to pings. The
only way to get it back to to pull power and restore it. We have moved
the drives to new hardware (essentaily ruling out bad proc/memory). I
have two possible theories:

1.) After this machine was build we wholesale migrated about 100 user
home direcrtories from Solaris 8 to this machine. All of these users
home directories had dot-files for system and app setting (.gnome,
etc...). In theory anything that RHEL uses would over write the old
solaris dot files, is this a correct assumption? If not, would this
cause instability enough to crash the entire system?

2.) The parent directory for all these home directories is a symbolic
link to another filesystem. So essentially anyone logging in is being
put into a symbolically linked home directory. Could this cause these
random crashes?

This system was up for well over a month when it was only being used by
10 or so users, now it is being logged into and out of by 100+
different users off and on all day (perhaps about 30-40 users total on
the system at the same time). Each of these users is loading an
individual Gnome session (this server is running SunRay software
driving 40+ dumb Gnome terminals). Thanks for any ideas/suggestions in
advance!!!

.