I have a board that consists of
- Arduino pro mini (ATMega328P, ceramic resonator, tactile reset button)
- SD card
- I2C sensors
- LTC3525 boost converter (IC, inductor, caps)
Very occasionally, if the board is accidentally dropped or knocked it will reset. Unfortunately I cannot seem to reproduce the problem, but it has happened on multiple boards.
Any ideas what the problem could be? My guess is the force of the drop actuates the reset button, or perhaps stops the resonator for a split second.
Edit: The board also has 2 x AA battery holders.