anyone else find that their new text tone keeps defaulting back to tri-tone? my text tone is calypso, but every day i find that it is playing tri-tone when i get a text. i go into settings and the tick is still next to calypso, but it play tri-tone instead. i tap calypso to set it back to that, and it then plays calypso for a while, then eventually it will go back to playing tri-tone again. obviously it's a bug in the beta 4, just wondered if anyone else had noticed it.