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I have an NXT brick that will always shut down after 5 minutes. No, it is not the sleep timer. Documentation from the NXT Hardware SDK, page 17, states that if the ARM7 processor does not send back communication to the AVR microcontroller within 5 minutes of power up, it will shut down the ARM7. Here is the message: "\xCC" "Let's samba nxt arm in arm, (c) LEGO System A/S"

Has anyone had a 5 minute shut down problem not solved by resetting the sleep timer and have you solved it?

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Is this "five minutes" measured while a program is running, or from the beginning of the NXT brick startup? –  shea Oct 22 '13 at 6:34
You might want to try updating the firmware on the NXT brick. –  bsaat Jan 8 at 21:59

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