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I experienced a similar issue. I would find that if I run all the nodes at once on boot, most of the time, one of the stereo cameras would not work. To fix this, I've created a number of scripts to stagger the launch based on what topics are running and made a public repository for anyone to use: https://bitbucket.org/P3TE_/roslaunch_helper

Take a look at the README.md for more information.

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