[ic] RPC mode not so reliable?

[Grant]

I've switched to RPC mode to prevent intermittent 500 errors in my
catalog, but now when I browse my catalog there comes a time when the
server will not respond.  Restarting IC always fixes it.  I'm on 5.2.
Is an upgrade the preferred solution, or is that unlikely to make a
difference?  I'm using the following settings:

PreFork                 Yes
StartServers            5
MaxServers              0
MaxRequestsPerChild     100
HouseKeeping            2
PIDcheck                120

- Grant