Any clue what this error is

I seem to get this error when ever I connect the drone via USB.
It doesn’t happen any other time.
I will eventually upgrade to the new gold firmware but right now this is occurring on 4.0.3. I had tried to upgrade before and kept getting 4.0.3 …odd…but will try it again.
Just wondering if anyone knew that it is.

If USB is only power source, it’s probably causing brownouts. You can check the board and rail voltage in mission planner.

yes thats a good idea. Had not considered it.