1| Can you please pass on your fulls system's specs? It's hard to gauge normal if you don't have abnormally high standard parts in your system.
2| Have you made sure your BIOS is up to date?
3| You may want to read through this.
Given this is a system with Windows 10 on board, have you popped up Windows' Task Manager and monitored how much ram and resources are being used while you're gaming? Since you have 16GB's of physical memory it seems like you're suffering from a memory leak. Might want to state which games you're taxing the system with.