Took delivery Sep 7 with software 18D, took it back to dealer first thing Sep 9 with black screen issue. Dealer updated to 19A. Black screen issue happened again this morning (Sep 18) and I took it back again. Hopefully 19B solves this issue for good.
There is some evidence the blank screen problem is in the telematics module, not infotainment where telematics version 14.2 seems to have the problem.