Was this ever an issue with the games when they were new?
No, the power supplies and regulator circuits were adequate at the time - the passing years have caused the problem as Nino says, the parts are well past their use by dates - it doesn't help that a lot of people seem to add mods (dragging down the already strained power supply) with little or no knowledge as to exactly what they are doing and thus actually bring forward the issues in a lot of cases.
