I have an iPhone 5 and betas three and four ran exceptional for me. Since the launch of beta five, I've had more app crashes than ever. Safari is constantly crashing, whether I have four tabs open or only one. iMessage crashes, especially when trying to add more than one recipient. These two bugs are only a few among others (such as the unlock effect on music playback). Is this the most unstable build for you guys as well? I was very impressed with the previous build.