Could be that your SD card is failing. You could try popping it in a PC, right clicking on the drive letter for the SD, properties, Tools tab, and hit "Check".
Glad you got it working, but I would make a backup of that SD card just in case. Another user on here posted this tool which sounds like a good thing to use to back up your SD card since it still sounds like it might be going bad to me:
It's an error checking copy program for things like SD cards.
SD cards go bad over time, so it's a good idea to back up your SD cards to a magnetic media drive periodically so you don't get caught with your pants down.
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