I have not had this problem with my TP2, it is not normal. I have had this problem in the past with older phones, and in every case it has been a bad/cheap cable. I have about 2 dozen mini-usb cables laying around from different sources, and have figured ones that are good for plugging in ps3 controllers, good for mp3 player, good for phones. Some cables don't support the charging of the phones, but transfer data just fine, if it's a device that doesn't draw power.