oscam and omnikey problem

Hello to all community,
i have a problem ,i have 4 omnikey reader and when oscam stops and if been restarted by web info or i restart manualli,oscam getting confused,all 4 reader become unknown reader.I have put the oscam restart script and i got the same problem.I have tried with the 4way hub in bus 001,and whitout usb hub bus 002 and nothing.
Please can sombody help me.
Thanks.

I have installed Oscam Status Check Script to restart oscam if web info is not working.
The problem is that this script dosent check if oscam running,but start oscam every 10 minutes that i have config in the crontab.
So in process remain open in 1 hour 6 oscam process,when oscam stops this script is restarting oscam and the reader is getting confused.
I have disabile this script and everyting work fine even with 4 omnikey reader...........

Problem resolved with new script

#!/bin/sh

process=`ps auxwww | grep oscam | grep -v grep | awk '{print $1}'`
if [ -z '$process' ]; then
echo "Couldn't find oscam running. Restarting server-binary" >> /var/log/oscam.check
nohup /usr/local/bin/oscam -b >> /var/log/oscam.log &
else
echo "oscam is still OK!" >> /var/log/oscam.check
fi