Unable to run two grc top blocks simultaneously

Hello there,

I am using two limesdr usb version and trying to run two different top blocks in gnuradio by using the script below. It worked once , a week later only one flowgraph was working. In term of limesdrs didnt give any error. Appreciate for any help. Thanks

cd /home/cicikus/gr-noname/apps/
sudo python control.py
exec sudo -u root /bin/sh - << eof
cd /home/cicikus/gr-noname2/examples/
sudo python decider.py