how can i correct? when i do video the image is changing from clear-to-blurred-to-clear-to-blurred

I think i have touch something in the setup that it makes my recording unbearable because the first time i use the camera it is not the same as this. How can i go back to my default setup?

my camera is sony cybershot DSC-P200. i've tried shooting moving images, how can i prevent from getting it blurred while recording. thank you so much for the reply.

Ok, so this sounds a bit complicated, we may have to try a couple things, and in the end it could be that the camera is broken physically and we can't do anything or that the camera may not be able to do what you want to it to do. Anyway, start by resetting the camera, taking out the batteries for 5-10 minutes, then putting them back in. Next, check the setup menu if there's a reset to factory default button (typically not, but some cameras have it). Past that, check that the videos you have recorded do indeed go from clear to blurred by transferring them to a computer or a TV (through an AV cable). If none of these solutions work, which to be completely honest with you, I expect them not to, they're the easy ones that sometimes work. Past this, it sounds like there's a problem with the continuous focusing mechanism in the camera, where it can't hold a focus (either ware and tear, or a malfunction), so it can't focus properly while recording video. Also, this camera is 3 years old, and video capabilities weren't really perfected until even recently, so I wouldn't expect much from the video.