Jorge,
its a know issue with some samsung devices right now, its actually their camera app that is causing the problem.. Good news is that samsung's 4.3 update seems to have resolved this issue (effectively its a memory bug). If you pull down a 3rd party camera app (MX Camera as an example) it should work fine. The 4.3 update has rolled out here for most of the devices in the US I would anticipate that Canadian carriers would be getting it soon.