I've done 3 DVC stays since the introduction of RFID technology and had problems getting into my room during all 3 stays.
I had a similar problem with a magnetic strip card during my most recent hotel stay in London.
New technology doesn't mean better technology.
Oh, c'mon ... So what if the iPhone still can't be counted on to reliably make and receive phone calls. All the kewl kids have had them since what? 2006? And Siri can direct me to the nearest place I can get a wax or tell me the difference between varieties of plums while I am driving the kids to soccer practice so it must be improving the world.