I'd be doing a fresh reload myself.
between the 5 second reboot issue, and those memory sticks, it would be good to start from a clean slate.
a fresh reload of Windows will get you down and dirty with the PC and as Windows reloads, things may become apparent.
so get Win10 on to a USB stick via the Windows Media Creation Tool.
only have one drive connected in the system, and have the PC disconnected from the web when you reload.
get your motherboard chipset drivers (sound, video, network, etc) ready from the manufacturers website.
load them after Windows, then connect to your network.
between the 5 second reboot issue, and those memory sticks, it would be good to start from a clean slate.
a fresh reload of Windows will get you down and dirty with the PC and as Windows reloads, things may become apparent.
so get Win10 on to a USB stick via the Windows Media Creation Tool.
only have one drive connected in the system, and have the PC disconnected from the web when you reload.
get your motherboard chipset drivers (sound, video, network, etc) ready from the manufacturers website.
load them after Windows, then connect to your network.