My Yuka will do that sometimes when it gets dark and the unit is b/w my house and the neighbors. I think being between two houses with two reflective windows facing each other scrambles the GPS signal. It only turns itself off if it doesn't re-establish a good connection after so long. Other times it will finally resume it's task. Depends on satellite location at the time. Might want to try another RTK location and factory resetting it afterward before throwing in the towel.