Every time a check my TRX-2 recorded files, once a week, there's at least one file that are corrupt. It's possible that the scanner playback function cannot handle files that refuse to be read. I always take out the SD card and copy all files to my PC and use Universal Scanner Audio Player that quickly can show me if it has any detected digital data or subtones that indicates a real conversation. I've tested different SD card sizes and speed and brands and the corrupt file issues happens to all of them.
/Ubbe