I have all four slots populated, I did rearrange them and restarted the system and it seems to be back to normal. I have encountered that a few times while swapping memory modules in and out of the system. There is something strange going on, maybe its a Windows issue or bios issue not sure.
is that an asus board? if so are you using the ram cache software? is the settings in bios ganged or unganged? whats your page filing set at, or virtual memory, or video memory whichever you like to call it..? is the bios set to interleaving or not? is that a matched set of ram, probably is just checking. sounds like maybe the mobo driver chipset irq calls are incorrect or maybe a bad channel or crack in board..
figure those questions out then try reinstalling mobo drivers to see if there is a corrupted chip driver first.. !
you dont have 2 8gb gpu's stuffed under the hood do ya? lol
I have the Asus Prime B350-Plus with the 0803 beta bios. The unusually high hardware reserved memory was seen before the beta bios. The way I got rid of it was to remove the modules and move them around to different slots, after restarting I haven't seen it again, it may be an issue with the version of Windows as I am running an Insider Preview of Windows version 1703 OS Build 16215.1000, I just found it odd that there was that much memory being used by hardware.
rog cpuid 1.78 also messes up aura. upgrade cpuid to 1.79.3 .. i do know the b350 boards are getting bios updates fastest due to memory issues with ryzen.