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I am using the ID12-LA RFID reader with an Arduino Pro Mini (5V, 16MHz). I am also using the software serial library to read the serial data form the reader.

Initially the serial data is being read properly, however after several reads (i.e. maybe around 10 - 20) the serial seems to malfunction and calling the read() function always returns a 0.

Right now the only way I can fix this is if I reset the Arduino. Also note that when I reset the Arduino the RFID reader is staying powered up (so it's not being reset or anything; this means the issue seems to be from the Arduino).

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closed as unclear what you're asking by Nick Gammon, fuenfundachtzig, Majenko, Annonomus Penguin♦ Sep 5 at 15:25

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.
    
We don't know what your code or circuit looks like. – Ignacio Vazquez-Abrams Oct 8 '14 at 5:16