sqlturbo zombies devouring CPU

I'm having trouble with runaway sqlturbo processes that consume 100% of CPU capacity, bringing our system to a virtual halt. We are running Informix OnLine and I-STAR (both latest versions 5.10.UC1) on a Compaq Proliant 3000 with SCO Openserver 5.0.4 with 504c update. Our clients are all Windoze 95 boxes with NewError 2.11. By way of background, cron is running a nightly script as part of my overall backup strategy. There have been three lethal bugs discovered in the tbtape archive utility, the last only a few months ago, so it can't be trusted as the sole backup system. This script shuts down the engine (necessary so dbexport can lock the database in exclusive mode), restarts the engine, runs dbexport and copies the output files to tape as follows: INFORMIXDIR=/usr/informix;PATH=$PATH:/usr/informix/bin export PATH INFORMIXDIRcd /usr/informix tbmode -ky sleep 10 tbinit sleep 10 rm -rf /usr/informix/ccms.exp dbexport ccms tar cv8 /usr/informix/ccms.exp This is not a 24 hour system, but some users leave their Informix application running when they leave for the day. The engine does not appear to be cleaning up all the user's sqlturbo processes and they are sometimes left in a runaway state consuming all available CPU capacity. Also, I believe in some cases that these zombies are orphaned due to Windoze crashes, which happen as frequently as Bill Gates can't remember. Of course, I clear them up after checking the process state, with kill -9. It would be helpful to understand why the engine is not terminating all sqlturbo processes. Absent that, I thought I'd add to my script a method to kill off any sqlturbo processes after the engine is shut down. Has anyone experienced a similar problem and/or have any advice? Thank you for your consideration.