Issue on iPhone 4 Camera Focus

I used to take videos of my kids using the camera on my iPhone 4. It was working well and I never have any problems with focusing. But after an upgrade to iOS 5, everything seems different. And it’s really annoying! If I clicked on the camera to start the video, it won’t let me start recording until it locks the focus.
It takes a second after you can finally tap the record button. Was it just me or is it another failure attempt from Apple’s new OS?
Whatever it is, how can I resolve it?
