Hokuyo UST 10LX Lidar can not run outside

[ArtlyStyles]

I am using a Hokuyo UST 10LX Lidar on my robot car. The Lidar in general work fine indoor in my garage. However, every time I drove the car outside, the blue light started to blink and no LiDAR signal came from the device. I have to reboot the Lidar. However, if I keep running the robot in my garage, it has not problem at all. The documents said blink lights meant the device went in to a malfunction state. Does any one know why and how to fix it?