not really. receiver should be speaker as well by designed. I dun think that is speaker / Mic hardware problem if it work well unless phone call....
I got a similar issue, I could hear my voice from receiver from time to time.
ROTFL. should be your lockscreen wallpaper
adaptive brightness issue is really annoying on my 7Pro. Seems that will not have a fix since I suffer on previous Firmware
turn off video enhancement
seems work after stopped battery saving and video enhancement.
facing the issue almost everyday. cleaning cache cannot help and have to restart the phone every time.
just realized it may caused by battery saving...