Hi, I have similar issues with my less than 1 mth old x201. Lenovo did come and swap my base, which is a major surgery that will take a bit of time due to the number of screws involved. It is just slightly better, unfortunately. It seems to be a quality control issue with Lenovo since the same battery has less play in an identical x201 that my colleague is using. I finally use a small piece of blue tac to fill the space and it is as tight as it can be! Too bad for such an awesome laptop.