Occasionally the sounds on my LG VX8600 just shut off for no apparent reason. I can still make and receive calls and hear people talking but the phone doesn't ring, makes no alert sounds of any kind and doesn't even beep when using the keypad. The only way to get the sounds back seems to be going to the tools and settings menu and viewing the volume. The volume settings aren't changed and I don't need to change them to get the sounds back, just viewing any volume setting seems to be enough.