I'd increase the memory by a few GB if it's possible to increase it at all. This might solve the problem. Hangs can be caused by viruses. WinSCP, if you connect to some ftp server and start receiving or transmitting data. This also affects the operation. RAID RECOVERY partially solves the problem without replacing RAM. While you can play games for hours and nothing like this happens. A full freeze means the last image freezes on the screen and stays frozen, and you just have a slow computer.