on the sides (the things that look liek fenders) take them off and check out your 1/4 gold renishaw strip there is one on both sides. this is the precision measurement strip it uses to identify where it is on the bed, sometimes dust gets on this strip and it can mess it up leading to a halt.
Especially if you notice that you get consistent halts on the same spot,, you can clean it lightly with a lint free tissue or microfiber, a little alcohol if needed. if the strip looks visually fine dont **** with it call a tech