Just my two cents worth: had the same thing happen, almost hit the workbench in the front of my garage!! Did the red brake lite come on too? Mine did. Found that the fuse blew, replaced it and it blew again in a short time. Was told by a good source that it is usually the brake switch that causes this, replaced the switch, all is good for the last nine months, go figure. As I said my two cents worth.
Dave
87 GN