Well it's not the cameras fault if you don't know what you're doing.So I'm pretty goddamn upset right now. My camera sucks.
I was trying to get a bunch of low-light shots today and the camera would say "busy" for 4-6 seconds before it would let me shoot. What the **** is up with that. I missed ALOT of really decent to great shots because of this. Hell, some moments completely passed by me because of this.
Yes, I was shooting in auto-mode, which was probably my problem, but motion + low light = no go with manual settings. Atleast I don't know what I'm doing.
Just bump up your iso and use either Aperture or Shutter priority mode depending on your needs.
BTW, What's the lens you're using? That can have the biggest impact on low light shooting.