By the way, I got the same anoying sound, I tryed all your tips, didnt work. Then a couple hours ago, my cell borders turn red, notifying me the memory was getting full. So I erase all my pictures and videos of my camera storage. The borders turn back to normal and sound stopped. I guess is a feature to remind you the storage is getting full. There is no setting, I could find it thru your instructions. But finally my cell stop making those noises. I had to turn off all sounds in order to shut my phone up. Even the ring sound. Missed a lot of calls, but phone keep vibrating. Awful but finally solved. Finally, Cheers... My cell is a Huawei Y5 lite 2018 CAG-L23 with android 8.1