I had the same issue after riding at the beach 1 time. A lot of people were like, yeah, real cool device there, doesn't even work.
After several minutes and hitting power on/off it started to work again. I think maybe it had to do with the sensors sensing the sand maybe? Got a few more rides out of it before it went back to the 14 blinks and personal space message. Sprayed it down at home and it was back to normal. Haven't had issues since.