My BV9800 PRO makes some strange sounds from time to time, it sounds like "tc tic", it is the same sound that the phone makes when the FLIR app is starting, like the camera is trying to focus. But I heard that sound even when outside the FLIR app and even when the phone has the screen clo...

I have the same problem. FLIR works with the *#87# test, but when I open the app all I get is a black screen where an image should be.