FARMINGTON—Joshua Saiz paces outside his mobile home, anxiously puffing on a cigarette and, alternately, flashing a grin at his young daughter. The gravel crunches under his shoes as he takes six short steps up, makes a tight turn, then six steps back. Always six steps up, six steps back. The 40-year-old former oil field laborer can’t bring to mind why he’s so consistent. But his wife, Nakrista Saiz, has the answer: “I’ve asked him, too.