This has only started to happen over the last few weeks. I find an icon in the notifications and on invesigating it says "SD card suddenly removed". It seems to happen randomly and is a bit of a PITA as the phone is in a silicon case which has to be removed before I can take the back of the phone and press the card back in. It's a Lexar 8gb card, which I put in the phone when I got it several months back. Anyone else getting this problem?