Ok, so i shoot with an a2 and sometimes when i press the shutter button, the curtain seems like it goes down and gets stuck and i am forced to tap the button again to release it, does anyone know why this is?, i was thinking like maybe because i use the autofocus and i hit it when its focusing so it confuses it?, i dont know, or is there a bug in my camera?

sry for my poor explanantion

-tony