Hi guys, I recently bought a relatively new pre-owned Galaxy sii and so far I am loving it. However, I do encounter a weird problem. It seems like I cannot completely eliminate the notifications and system sounds. In silent mode, if I go to applications>settings>sound>volume and slide the bars for notifications and/or system to zero, click ok, then click on volume again to check, the changes I made are not saved and the slide bar will go back to its original position. It works fine for media and ringtone, it just won't allow me to make the changes to notifications and system. A little background info, as soon as I got my phone, I restored it to its factory settings and after that I upgraded the firmware to 4.0.3, which I think is the latest version. I installed some games, facebook, whatsapp, advanced task killer, powerful control....etc. maybe it is one of these apps that's preventing me from muting?? I'd really appreciate if someone can give me some advice on this. Thank you!