Have the sound problem with external speaker. Took it to store today and of coarse it worked as soon as rep took phone out of case. <img src="http://cdn.droidblog.net/forum/images/smilies/smile2/icon_evil.gif" border="0" alt="" title="Icon Evil" smilieid="44" class="inlineimg"> but once I got home and tried to use speaker phone; no go. Now after reading forum I tried deleting all apps involved with sound and still nothing. But then I got to this post that talked about rubbing finger just below speaker and voila speaker worked instantly. Has quit working since and I have taken out of case and rubbed again and instant fix. So must be a hardware issue for sure.
have you tried the app above: