Updated my iPhone 6 on Saturday morning and it's been a disaster since then! I've spent over three hours on the telephone to Applecare and at least twelve hours trying to sort out the problems. (Without success.) Initially I thought it was just a problem with sounds, but when I contacted Applecare I was guided through re-installing 10.3.2 via iTunes rather than over wi-fi, 'because it is more robust'. I had to backup my iPhone to iTunes on my MBP, then reset my iPhone (I think), which included reinstalling the software, and then I had to restore the backup I'd just done on iTunes back to my iPhone. It took about five hours. Now everything on my iPhone is soooo slow, the keyboard has a delay between tapping and the characters appearing on screen, apps crash repeatedly and often, including Apple proprietary ones like Photos and Find My Friends, but also low-data-hungry 3rd party apps such as the BBC News app. I basically have an iPhone that was fine on Friday, and is pretty well useless -apart from as a basic phone- now.