PreArm: Compasses inconsistent

Pixhawk 3DR
Compasss/GPS 3DR
TBS frame
740Kv motors
Power module 3DR

I can calibrate the compass/GPS module and fly with no problem but when I reboot the next day I always get this error. I am using MP 1.3.17,  firmware 3.2.1. I received this Pixhawk last Nov. (2014). Is this a hardware issue?

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