Hi, I've just replaced the flex cable which links the volume, mute, lock buttons and headphone jack hoping that it would fix a problem which has developed on my daughter's iPhone 3G but it hasn't. The issue is that the mute switch when active also causes the red slider to come up as if the lock button was pressed. Also, the volume buttons have the same effect and cause the phone to lock (as in go to sleep as if lock/sleep button was pressed) when pressed. Volume can be controlled from the sounds applet in settings but obviously this isn't as handy as having the mute button and volume buttons. The phone is on 4.2.1 and is not jailbroken. I've tried several restores including a couple of DFU restores and I get the same result. I'm confident I've assembled the phone correctly as I'm an experienced electronics engineer and have done this sort of thing many times. I'm wondering if the connector (number 4 I think) which the flex attaches to may have some bad solder joints. Perhaps a bad earth connection and so the buttons are interacting due to floating voltage levels. Anyone had this issue and found a solution? Any good workarounds available? Or jailbreak programs to counteract this issue? Many thanks, Craig.