Pole breakages can happen for many reasons, mainly weather, flysheet tensioning or when pitching/striking the tent. As a precaution:

• always make sure the poles ends are fully engaged in each other
• tension the flysheet firmly but not over tight
• if your tent has a "Tension Band System" do not over tighten
• when it is windy make sure the flysheet is taught to avoid loose fabric flapping
• when the tent is used in extreme temp variances, loosen / tighten the flysheet
• always carry a spare section or two and a repair sleeve