Board Thread:Game Discussion/@comment-34926837-20180708050203/@comment-77.22.7.226-20180708070055

I think I know what you mean @ OP, sporadically having it too (IOS 11.4, Ipad Pro 10.5). It could have something to do with putting your thumb to high, in the upper half of the screen, without you deliberately knowing that's the case (after all, you're concentrating on the line, not on your fingers). Try adjusting your thumb position a little more down.