No sound is recorded intermittently when shooting videos, this happens approximately 1 in 7 recordings there is no way of knowing if sound is recorded or not so can be a big issue if you record something where sound is essential. Other owners have raised this issue on YouTube. Surely Sony are aware of this and should be advising owners and working on a fix as a matter of priority. Only returned to Sony when the XZ2 Premium was launched and paid a premium price as I'm in the UK.
All of those permissions are on but every 6/7 recordings start with sound for about one second and then the sound stops being recorded. I'm sure this is a bug in the camera app. Given the reason most people will buy this phone for its camera and video capabilities surely this issue should be urgently looked at by Sony.