Yup its common among Ps3 (a ps3 user myself) but I have run into a couple of pc users who experienced the same thing. Basically the game just freezes and your character is stuck but you can still access menus, move cameras and what not and in some cases can even log out. Its mostly a network issue on SE's side and a combination of lag spiking and the game not recovering from it; hence you're frozen. A work-around is just to force quit by pressing the PS button and quitting the game. Also for me, this never happened until the 2.05 hotfix.