After installing the latest Windows updates, including Version 1803 and KB4100403, my Toshiba XG5's sequential write speeds have fallen from ~2000 MB/s to ~460 MB/s, slower than its 4K 8 queue depth, 4 thread random write speed.
Something is not right here! Can Microsoft please clarify what changes were made to the NVMe drivers for the XG5 series and investigate this issue?
My SDD is the Toshiba XG5 512GB, KXG50ZNV512G.
My system is the Huawei Matebook X Pro, Core i7, 16 GB, MX150 configuration.