Sandy's iPhone 8 Plus is starting to touch lag severely. Is Apple deliberately slowing it down to get her to buy a new iPhone? Leo says probably not. But it may be high time to back up her data, wipe it, and finally restore it. Leo says that some iPhones have been recalled in the past for touch lag, but not in the iPhone 8 class. So it's likely it just needs to be refreshed. A new battery is also probably a good idea. Apple has a battery replacement program, for $90. What Leo recommends is going to the Apple Store and talk to the genius. Then see what they think. But she can start first with the reset.