My ROG 5s' camera stopped working with a "Camera is not ready. Please try again later." popup every time I try to use it.
This appears to be a software bug as if I go to Security & lock screen>Google Play system update, Install a 157kb update & reboot, the camera starts working again. However after rebooting the phone only stays on for ~20 seconds and then it reboots again and rolls back the update.
If I go to Security & lock screen>Google Play system update after rebooting, there is another 700kb update but by the time its installed the phone reboots and the installation doesnt complete.
So this seems to be a software issue but it apparantly cant be fixed by downgrading/factory reseting/etc.