Another problem going on with Apple devices (UPDATED: It's NOT Apple's fault but mine, perhaps)
UPDATE
My case might turned out to be my fault. Some kind of water was in dock port of my iPhone or 30pin terminal of a dock cable. And it perhaps caused a short circuit when my iPhone connected to USB port with that cable.

Anyone else having the same message pop up repeatedly?
Immediately after activating my phone and restoring my data, this message starts popping up for no reason I can identify.
No audio from iTunes, video files, or applications coming from the bottom speakers (only available via headphones).
Ringtone, alarms, and regular speakerphone work without any problem.
Never plugged into an accessory device and bluetooth has remained off since delivery...
It's madness...or perhaps a spooky ghost device haunting my new iPhone 4...
iPhone 4 reception matter, iTunes accounts hacked and here's a new worldwide level problem. No accessory = "This accessory is not optimized for this iPhone..." To date, the situation has not improved.