Strix z370 F gaming QVL changed, new version online is the 2017/12/29 Asus cheats on ddr4 4000 compatibility, now the company detele the support meanwhile the specs tells that this mb supports ddr4 4000 this is a big cheat from asus . Check all z370 qvl updated to see if something 's changed on yours.
The new QVL list on the Z370-E doesn't make any sense. It's called "4DIMM_memory_QVL_report" but it still lists kits that doesn't support 4 dimms and leave out some kits that did support 4 dimms on the older QVL report. Also, how they tested 8 x 16GB of memory on a board with 4 dimm slots I have no idea. And yeah, the new report is missing 4000mhz all together, also jumps from 3000 to 3866mhz skipping all inbetween.