I also have 'Cant connect to camera' on my S960, and I tried different software things with cache, another camera app install, etc. Nothing solved the problem. After that, I've done full software reset to the factory settings. That also didn't help. After a month or so, when I decided to go to the service, I tried full reset again, and my camera problem dissappear!! Now it's working perfectly, and my phone battery last longer than before (I don't know is this related with camera..)