Why will the starter drag after the engine is warm when trying to start but no problem when cold?

When the engine is warm, the oil becomes less viscous, which can lead to increased friction in the starter motor or related components, making it work harder to turn the engine over. Additionally, heat can cause components like the battery or ignition system to perform less effectively, reducing the available power to the starter. If there are any issues with the starter itself, such as worn brushes or a failing solenoid, these problems may become more pronounced when the engine is warm, leading to drag.