One in a while when I flip the breaker for my autohelm 7000 autopilot an alarm whistles and nothing shows up on the screen. It usually corrects with one flip of the breaker, but on a couple of occasions, it has persisted all day despite flipping the breaker and even shutting down the 12 volt power. The next day it once again works perfectly. I hesitate to have anyone look at it while it is working. Unlike my car with an OBD2 port, I don't think there is anything that will register the fault. I am open to any ideas.
Thanks in advance.

Craig