Flashing blue light on top of Goliath

My Goliath is behaving very strangely and now has a flashing blue light on top. What does it mean?

I observed blue light blinking while zaxis is moving. Turn off and on again may correct itself.
Some times the spindle cage can get stuck under the router and the brush on the bottom crushed.
Press and hold the middle button till it resets- red light. Restart goliath.
All trial and error- good luck.

So far, lots of trial and nothing but error. I’ll try a restart but I’m not looking forward going through the time consuming start up procedure.

Thanks for you help.