we have a 4800 and have had it since new in august. It will cut a pattern or file just fine , then will not cut the whole pattern or file the very next time. No changes were made . This machine is not productive and we have lost money already due to it ruining designs. Im going out of my mind cause it never shows any error. it will just simply not cut or stop cutting or it will just fail to do anything at all. Please help. the controller is part number bk1250-200000 and serial number is F24610618. its an ACCUMOVE 2