I have a Lenovo Ideapad 330-15ARR, it has 4GB DDR4 2400mhz ram (soldered). I decided to upgrade it with another 4GB DDR4 2400mhz ram. When I first installed it, the first thing I did was to run the Windows Memory Diagnostic Tool and there was no problem at all, the newly installed ram is fine. But, one time, while I was working on a school project, the system just restarts randomly. I don't know if it's the ram that's causing this issue because the memory diagnostic tool said that there were no problems with the ram.