Different strange things with Naim Nova

Sometimes the level display indicator on HDMI doesn’t show when ± the level.
Sometimes the ARC on HDMI wont switch auto to TV when turned on.
Today Naim auto switched on/off several times by it self.
Can hear lo noise from the speakers when switched off (somebody says that’s normal)

Anybody have that kind of behaviour? Should be a hi-end product and not do as a product from the local hifi store right?