Hi Gmann77,
Welcome to The PCHF,
What you are describing might be a temperature issue. Do you have a seperate graphics card or is it onboard ( part of the motherboard)?
If it is onboard you might want to try and download the app
HERE and let us know what the temperatures that are shown.
If the Graphics card is PCI/AGP/PCIE (seperate) you might need to check, if it has a cooling fan, that the fan is working properly and free of dust. If it doesn't have a fan
turn the pc off, and check if the heatsink is very hot or not.
Let us know how you get on and we'll take it from there.