Have you ever noticed how warm your modem or your router can get? They are electronic devices, and they often have no internal fan, only relying on vents to help dissipate heat. Most of these devices are designed to sit on a hard, flat surface (like your desk). Placing your modem on soft surface (like the carpet on your floor), covering the vent holes on the top, or placing your modem in direct sunlight may cause it to start overheating. This can lead to poor performance, or even permanent damage to your high-speed modem.