Question Incompatible Ram

Jul 23, 2019
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So I finally got my custom AMD build from the courier like 5 days ago, I installed windows drivers and everything.

2 days ago tho, my ram started acting up and I got the 8GB (3.93 Usable) Problem, and I couldn't do anything to fix it
After some reaserch I found out that it wasn't compatible with my ASRock AB350M HDV R4.0

But I was left wondering, why did it work fine for the first 3 days and then it started acting up.

Specs
Processor:AMD Ryzen 3 1200
Video card: Radeon RX590
Ram: Corsair Vengeance LPX Black 8GB DDR4 2400MHz CL16 Dual Channel Kit CMK8GX4M2A2400C16
Motherboard: ASRock AB350M HDV R4.0
HDD:Western Digital 7200RPM 1TB SATA III