simultaneous SD card issues
 

Hey all, been fine for years, something new happening last 2 days. I shoot to 2 simultaneous SD cards for legal video. I format both cards before each work day and begin. Yesterday 1 card stopped recording and was flashing fast. Manual said card was full even though it showed 500+ minutes. Today I confirmed both cards were formatted and started with same recording length. 1 card stopped again, flashed fast. Just wondering if others have experienced this before. I will of course use 2 new cards next week and see what happens. Thank you.