The 10 nm process gave Intel quite a bit of a headache in the past few years. It was supposed to arrive in 2017 initially, but the fabrication process had to be delayed because of design problems, and it looks like Intel may not be able to launch the 10 nm CPUs come 2H 2019 in large amounts either.
https://www.notebookcheck.net/Intel-denies-rumors-concerning-the-death-of-its-10-nm-node.344121.0.html