3GS speaker very quiet since iOS 4 update

[0dev]

I just played some music on my iPhone 3GS after updating to 4.0, and it is very quiet.

It isn't a problem with the settings because sound check and volume limit are turned off, and it still sounds fine through the headphones.

I also don't think it's hardware, it's been fine before and I haven't dropped it or anything.

Anyone got any tips or also having this problem?

 

[0dev]

Nevermind, a reboot fixed it.

It's weird though, because I worked out that, actually, it was actually playing the music through the top speaker that's usually used for phone calls

iOS 4 bug much?