Noticed something not that big of a issue but might cause issues for some people,not sure...

I logged in and noticed my deposit address had been reset and was blank,waiting for me to click a new address.
Presumed these addresses where static some what,is it safe to presume this happens often enough to not put it as in my profile here?
Not sure if I caused that issue by resetting my browser as well,just thought I would address the issue and see what the word is on stability of a deposit address.

Guess I want to know if I can rely on it to be my deposit address for say 2 weeks,a month or if it is just a thing I need to keep a eye on in the future.

Also can I get a link where the restricted freeroll for Sunday goes through the requirements,I looked yesterday but failed to see anything besides what was written in the lobby.

Thanks.