How do you know if you should return your iPhone 3G due to malfunctions

Well I have been having some problems with my iPhone lately but I'm not sure if it is something that I can fix on my own or if it is a defect. Here are some of the things I have been experiencing.
1) Like a few others on the boards my phone has been resetting its volume. Each time I put it to 100% volume when I check what level it is under the settings it always goes down to around 50% or less. I know I did not touch the side buttions because it has even done this while it is charging, while I'm not touching it, or when it is just sitting on my desk.
2) My sound just completely stops working. THe keyboard click often turns off without me doing so, although it is still marked as being on under settings. My text ringtone often goes silent as well while under settings it says it is supposed to be the "horn" for example.
3) And just recently my iPhone just completely went blank. I have about 45% battery left and out of nowhere my screen goes completely black. I'll get a text message the screen will flicker and then go back to black. I tried plugging it in and the screen appeared for a second and then went back to black. The phone is on however because I am still able to receive texts.
I would just really appreciate your guys' help. I'm not sure if I should take my phone back and exchange it. I definitely love the phone but I know I'd love it even more if I didn't have to deal with these issues. And if it is defective do I just go in apple and explain my issue or problem?
Thanks!

Do a search for "List of common problems" on this forum and cxheck if your phone has these problems too.
Then write the list down and take your phone back to the place you got it from.
They should be very helpful and exchange for a new one... but when you get the new one check in the shop that the common problems dont exist on the replacement!

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