What ever you do, don't try to loosen it or even open and close it just to make it looser! Mine was loose when i bought it and it ALWAYS opens in my pocket and makes me think i should be babying it. I can even slide to unlock it and it slides open. BTW: just learned the droid is made of gorilla glass [look it up on youtube] you can take your screen protectors off now!!
Yea mine started being hard to open today too! So i blew inside the things it slides in it started to slide much easier! You should try it, I think it starts getting harder to slide because of dust and such getting in there