why god why

I am the "proud" owner of this pre built...what do i do now? lol I use this as the slowest option to load things like Hearthstone. I also use the computer to store photos from my iphone. Also I am moving on, seeing pricing on DIY for $800 that would put this to rest, but I have a weird idea...

8 gb(2x4gb) only shows half the value I checked cmd, Windows, and BIOS. They all show 4gb installed. It all started when I suddently got huge frame drops while playing COD: Warzone. I then realised my total ram had gone from 32gb (8gb(2x4gbx)x4 slots) to 16gb. I have tested every single stick...