I bought a new Nvidia card, installed the default Nvidia drivers through synaptic and the "freezing" problem has disappeared. This PC previously had no graphics card except for an onboard built-in intel graphics chip that didn't seem to do very much.
I bought a new Nvidia card, installed the default Nvidia drivers through synaptic and the "freezing" problem has disappeared. This PC previously had no graphics card except for an onboard built-in intel graphics chip that didn't seem to do very much.