iOS 16.0.2 and this just starting happening to me today. iPhone 12 Pro Max. If I’m on my phone, I get notification banners and sound, silent button flipped up, but if I lock my screen, put my phone down or in my pocket, I get notifications but zero sound. I’ve tried all the tweaks and possible solutions here with no luck. Hopefully Apple can fix this. I’m also a watch user in that helps any.