Client Access TN5250 drops

About a month ago, we switched from one AS/400 to another.  The reason was
financial, renewing the lease on the older system was a hit the company
couldn't afford anymore, so we permanently switched to the disaster recovery
mirror.  The machines were almost identical 720's, both at V4R4, same PTF's
installed, etc.  The main difference is that the newer machine is at a
remote site, connected to the rest of the WAN by a dedicated T-1 line,
whereas the old machine was here at corporate headquarters.  The problem
we've had since day 1 is that we lose 5250 sessions with some frequency,
both here and at the remote plants.  Although we had occasional problems at
the plants with the old machine, they are much more frequent now, and we
never had this problem here before.  We've tried installing the latest cume
and all group PTF's (as of 2 weeks ago), but that had no impact.  The line
has been checked six ways from Sunday, with nothing ever showing up.
Connections to the NT box that the /400 shares the room with are rock solid,
although no one connects to it by telnet so the comparison may not be fair.

We are on V4R4, and the PC's are running a mix of V4R4 Client Access Express
and V3R2 Client Access for Win 9x/NT.  The session drops are pretty random -
I normally have 4 sessions open, and I usually don't lose all 4 at once, nor
do we have many instances of losing more than a couple of users at a time.
Service pack levels at the PC's don't seem to matter, I'm running the very
latest, but we have some with pretty ancient packs which are no more nor
less susceptible.  Does anyone have any suggestions?

There used to be a list of all the latest TCP/IP PTF's available for V4R2,
is there one for V4R4?  If so, does anyone have a URL or an Information APAR
number?

Thanks in advance!
Dave Shaw
Spartan International, Inc.
Spartanburg, SC
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