I have noticed I am having a problem with iChat when on my battery power and using wireless. After a while, it stops working. I won't receive any of my messages or know anything that is going on. I never know when it has stopped responding. Later on, it will sign me off. If I plug into my power adapter, iChat will work without any problems. Any one else experiencing this or have an answer to fix it? I use my iMac on the wireless and it works perfectly fine on iChat.