I have recently used a magnet car phone holder with my Samsung Note 4. One day out of the blue, the phone said "the SD card was removed, please insert a new one" when I hadn't touched the SD card at all (it was put in when I first got the phone). And then even the computer won't recognize the card. Is the card ruined? Did the magnet do it? Will continuing using this phone holder eventually do the same thing to the phone?