It’s been my experience that broke things simply do not fix themselves. This is regardless of the device; whether it is a brake caliper, a computer monitor or an electronic device. If your 3808 was giving you fits from a malfunction (and not user error), and it suddenly decided to work correctly, it is only a matter of time before it fails again, but the next time it might just take a neighboring device with it.
Unfortunately for you, it is also my experience that unless the device is in a failed state when the technician works on it, or if it does not log error codes, you will be told that they could not find anything wrong with the device. New auto warranty work is the worst.
