I've had the same problem with my jB. After a prolonged period of experimentation, I've found these steps to work every time:
1) Remove the SD card only when the jB is turned on, and displaying the main menu. Removing SD card under any other circumstances will cause problems.
2) Manage the files on the SD card with a card reader. For .txt files, avoid using "(" and ")" as part of the file names. It may or may not crash the jB.
3) Before inserting the SD card back onto jB, make sure that the jB is turned on, and the screen is displaying the main menu.
Hope it helps.
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