Samsung SGH-D807 / D806

yeah I've had my phone for two years now, and for a while now, I'll just a get a voicemail from someone automatically without even a missed call, it's very weird. there's lots of other things happening that's getting annoying also, like I'll just be texting, and automatically it asks if I want to save the message to drafts, and I didn't even push a button to cancel out of the message, and even if you say NO or YES, it still takes you back to the menu. Also, on the side of the phone, you can control how high or low the volume of the ringer is, and whenever I push that button, the ringer just keeps going when I take my finger off the button, it just keeps going and going until I fix it, it's really annoying... I wish I could get a new phone.