So I'm using Safari, Opening one or two different windows, and everything is fine. But when I go to close a window, it locks up, solid. I can press the home button and get back to the home screen, but when I click back onto safari it is still locked. I can't scroll through windows or even just get one to close. Sometimes, on occasion, it will close the window I'm on, then run VERY sluggish on all my other windows. I've cleared all my history and cache, I've even gone as far as restoring my phone, and not from backup. Any Advice?