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I had a similar problem with a USB device using the pl2303 driver. Every now and again /dev/ttyUSB0 would vanish and /dev/ttyUSB1 would appear in its place. I solved it by running a cronjob every 15 minutes that did the following: if [ ! -c /dev/ttyUSB0 ] then echo `date` Device missing echo `date` Stopping zmconcopy `/usr/sbin/rczmconcopy stop ...

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