For the first issue, try installing the latest BIOS version for your motherboard located at:
Also install all the available updates for the USB devices.
For the second issue, make sure that the processor does not reaches above 72.6 degrees Celsius as showing at:
Otherwise it will be overheating.
I would also recommend checking with the game developer for the graphics requirements for the particular games, to see if your current hardware configuration complies with their requirements.