The answer to 'why is my landscape lighting disease' is that your landscape lighting is likely not actually diseased, but rather experiencing common issues that can cause it to malfunction or appear dysfunctional. Some of the most common causes include faulty wiring, worn-out bulbs, damaged fixtures, and issues with the power source or transformer.
Symptoms of landscape lighting problems can include lights that won't turn on, flickering or dimming lights, and uneven or patchy lighting across your landscape. The good news is that many of these issues can be resolved through DIY troubleshooting and basic maintenance. However, more complex problems may require the expertise of a professional landscaping or electrical technician.