I'll add a little bit because I don't remember reading it - another bug-ish thing related to the ringtone.

Now, when the phone gets the ringtone bug (seems to be pretty frequent lately, I'm talking within an hour of uptime guaranteed), no other notification sounds will play - no text sounds, no e-mail sounds, etc. The device will still play sound itself, but the notifications won't. While it's bugged, if you go to sounds & notifications and have it try to play a sound, it won't play anything. If you tap OK, it will think for a little while then just reset everything on the sounds & notifications screen to be just as if you had opened it, you can't close it.

I don't know, not vital to say, and probably will be fixed with the sound corruption fix, but if anyone else is experiencing it, it's "normal" for right now.