The answer to 'patio installation disease' is that there are several common issues that can arise during patio installation, including improper drainage, poor soil preparation, and the use of low-quality materials. These problems can lead to a variety of symptoms, such as cracking, settling, or uneven surfaces, as well as the growth of weeds or moss.
In many cases, these issues can be prevented or mitigated by following best practices for patio installation. This includes ensuring proper drainage, using high-quality pavers or stones, and properly preparing the soil. However, if significant problems do arise, it's often best to call in a professional landscaping contractor to assess the situation and provide a solution.