I've not heard of this either... but have to ask... have there been any "modifications" done whatsoever, to the bike... as in adding electrical items, or plugging devices into the "aux" circuit up front or in rear, to pull power for an 'add on'...
If not, I'd suggest getting into the main harness, that ties to the dash, and unplug/replug all those connectors a couple times... and see if it goes away.. just might be a "loose pin" or a short in one of those connectors. Same thing with the relays a BDF notes, "unplug/replug in"