Since the release of iOS 4, a number of complaints about Bluetooth have appeared on the Apple [AAPL] support forums. It seems like those who decided to upgrade from iOS 3.X to iOS 4 have been getting the problems with patch connections and bad audio quality.
The problems are not all related to those who have upgraded though as some who run the iPhone 4 which is supplied with iOS 4 are also reporting the issue. The problem with playing audio wirelessly is also being reported.
Apple at the moment do not seem to be doing anything to fix the reported issues although right now it isn't clear how much of a problem the new iOS is causing.
We suspect that they are investigating in the background quietly before admitting a problem. As with the antenna problems reported, Apple like to test and see things for themselves before speaking up about something.
Unfortunately, if you have upgraded to iOS 4 then there is no official way to downgrade to iOS 3.1.3 or below, so for now it's a matter of waiting for Apple to look at this.
Let us know if you have seen these issues.
Via: SlashGear