I got my R4 yesterday, and of course made a start putting on software and stuff. After switching my microsd card from R4 to usb and back a few times, I noticed the card simply would not remain stuck again. After a few frustrating moments it sometimes remains in, but without a click. When I take it out and re-enter I have to go through the same deal again. :'( Has anyone else encountered this problem and found a solution for it? I may go and switch it with the reseller a few miles north of here this weekend, though I believe he has none in stock for the moment.