I have the same problem. It is definitely the auto focus - I have an app that scans a QR code to check lottery numbers and the click is in perfect sync with the autofocus changing.

Dear Sir /Madam I have just purchased a BV6000s. Two problems. Android pay doesn't work - it reports " Android Pay can't be used with this device - This may be because your device is rooted, has an unlocked bootloader or is running a custom ROM. As a result, Google can't confirm that your devic...