Problem with Foxbase and Xenix

[Don Glover]

We have a client that has a Foxbase application running on a 386 with 10megs
of memory.  This client has a megaport 12port board which has wyse 60's and pc's
tied as data entry stations.  The application works in such a manner that
as the data entry operators finish their screen a mailing lable is generated
on the local printer attached to the station, there are 8 operators working
at their top speed.  The problem is that every time a lable prints on one of the
printers, ALL the terminals freeze and type ahead data is lost.  Would anyone
out there hazard a guess as to what might be causing this?