I own an iphone 6+ too, this could also be a hardware issue. It started for me with the touchscreen going unresponsive for a few seconds and then suddenly 'catc

I own an iphone 6+ too, this could also be a hardware issue. It started for me with the touchscreen going unresponsive for a few seconds and then suddenly 'catching up', it got progressively worse so I got it repaired. Hopefully it's purely a software issue in your case but just in case : https://www.apple.com/support/iphone6plus-multitouch/ https://www.apple.com/support/iphone6plus-multitouch/