還有個原因:趨近感應的紅外線一直處於開起狀態..之前iso5可關閉..http://tw.tech.yahoo.com/apple_mobile/article/id/27138/%25E7%2599%25BC%25E7%258F%25BE%2520iOS5%2520%25E5%258F%258A%2520iPhone%25204S%2520%25E8%2580%2597%25E9%259B%25BB%25E7%259A%2584%25E7%25A7%2598%25E5%25AF%2586