So my iPhone 6 Plus has developed touch disease. Although I've had a 6 Plus since launch, this is not my original; that was replaced just before the 2-year mark with a refurbished phone due to mute switch failure. This phone I've had since then, and I've replaced the battery and the screen in it. It's scratched and dinged, but it's served me well. I had been hoping to continue to use this phone until the new Plus model comes out this fall, but this issue is making my phone all but useless. So I'm now facing a decision: should I get my phone repaired under Apple's special repair program for affected 6 Pluses for $149, or should I bite the bullet and get a new 8 Plus now? I would probably purchase the 8 Plus through the iPhone Upgrade program with the intention of keeping it at least two years. What say you?