Camera cannot flip

[ayan_sharma87]

Asus 6z camera sometimes says 'Camera cannot flip' when taking selfies and the camera doesn't rotate to front.
What is this error ??

[Anders_ASUS]

How often does this happen? 

[ayan_sharma87]

Daily twice or thrice.

[kikoly]

Does the screen protector block the sensor?

[suresh_tulaband]

For me this happens with inbuilt AppLock feature. When I open an app.. camera can't flip. Happens regularly with all apps that are locked.