iPod and Mail help

So I've had my iPhone since day 1 (June 29, 2007) and I've loved it dearly but it has become a more frequent occurrence for my iPod on my iPhone to crash randomly while playing songs, often a couple of times in 1 or 2 hours, and also Mail has been acting strangely as well. Sometimes it also messes up when I try to turn it on or wake it from sleep and even sometimes the edge network doesn't work on some applications when it will update the rest of them. Any suggestions? Would this be cause for trading it in?