Right out of the blue my iPhone 7 has developed a strange problem. I use Safari to search the Internet and the problem is that when I select, say, Fox News the page comes up and then disappears. In other cases, a page comes up for a few seconds and then keeps repeating the operation endlessly. In a third option a notice appears: "A problem repeatedly occurred on "https://...." This also occurs in a social media app. e.g. when, say, a news item is displayed and I click on it to get the actual URL.