Exclamation Camera focusing issue? (with video)

There is another thread on focusing issue, but I don't know if we are talking the same thing since the OP set the focus to infinity, not auto.

Z1 Compact camera loses focus easily in dark/bright situations. Not only in video mode but in photo mode too, obviously. It happens all the time, even on far objects. Here I demonstrate with screen of another phone because it is a very good dark/bright object with a great contrast.

I've tested on stock, CM and Slim camera apps. This video is taken on Slim camera.

Do you have the same problem?
Sony Xperia Z1 Compact D5503 | Samsung Galaxy S3 i9300 | Motorola Moto G XT1033 | Google Nexus 4 | Sony Ericsson Xperia Arc S LT18i | Google Nexus One - best phone ever