The same thing happened to me, for 3 days set off alarms both entering and exiting Walgreen's, and also Burlington Coat Factory and Walmart. Yesterday I noticed that the WiFi setting on my Droid Razr had been accidentally turned on, so I set it back to off. Today, when I went into Walmart, the alarm did not sound, so am thinking that the WiFi setting must have been the cause. This was the only recent change on my phone, no change of battery or case or anything, and no variation of handbag contents. By the way, no one stopped me, questioned me, no store security or anything...