Why my olympus mju ii (stylus epic) tries to open itself all the time?

Hi,

I always carry my olympus mju ii (stylus epic) with me, in my pocket or my bag and it started to do this weird thing where it tries to open on its own but get blocked by the thingy you pull to open it.

Any advice? I'm worried it will get damaged, also it must empty the battery pretty quickly?

Thanks

L