Why isn't my LG Optimus Dynamic II making notification sounds and why is the ringtone changing on its own?

[iamtush]

LG optimus dynamic II not making notification sounds and ringtone changed on its own

Last night i tried moving my mp3's to the sd card with file manager. It didnt work. So then i tried hooking the usb to my aunts acient computer. When i synked it it automatically downloaded her pics to my phone but it wouldnt pick up anything on my phone. Now when txts email facebook messages come theres no alert sound and the ringtone changed itself. Checked sound settings everything is on and at full volume. I also restarted it.