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Probably one of them is terminated because it is running rosserial with the same name.

For example, let's say you are doing the following

$ rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB1
$ rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB2

In that case

$ rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB0 __name:=usb0_node
$ rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB0 __name:=usb1_node

I think the solution is to name it as.

ref http://wiki.ros.org/Nodes#Remapping_Arguments.Special_keys

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