My 80w laser fires when making moves to and from cutting lines

my laser fires when moving to the origin and when making rapid moves to and from lines to be cut, also when you press pause or run the faming option.
note i hvae just put in a brand new p s u as the other packed up but this problem used to happen now and again what could be the problem ? the controller is a topwisdom but i run lightburn 1.1.04.
any help would be greatly received .