You are not the only one with the intermittent sound notification issues. Was working perfectly fine before the 3.0 update. Since then I have had roughly two or three times an hour, that I have recieved a text or email and no sound made. Have even shown missed calls because of this (no vibrate notification either). Have called AppleCare and they basically just said to do a full restore - which was the first thing I done. This is already a replacement handset (3G) and I have better things to do than to keep going back to the local Apple store to swap it out every 3 months!
Battery life is also much worse, even with PUSH disabled. I have also noticed that I am getting a lot more dropped calls as well than what I did before.
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