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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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We don't know what your code or circuit looks like. –  Ignacio Vazquez-Abrams Oct 8 '14 at 5:16

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