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"randomly dying" is a symptom of a wide variety of bugs and other programming errors; most of which result in some form of memory corruption.

I suggest you run your node in gdb or valgrind; if you're running your node from a launch file have a look at http://wiki.ros.org/roslaunch/Tutorials/Roslaunch%20Nodes%20in%20Valgrind%20or%20GDB , or if you're using rosrun you can use the --prefix option to run gdb:

rosrun --prefix 'gdb -ex run --args' my_package my_node

or valgrind:

rosrun --prefix valgrind my_package my_node