This would appear to be a safety worry. Are these occurring due maintenance problems are and are more problems occurring due to the age of the turbines.
More information is a major requirement.
In Germany there are 26,500 wind installations (42 GW onshore and 4 GW offshore), with merely 7 accidents per year. Mostly rotor blades broken off or fire after a thunderbolt. Over the last four weeks however no less than four towers fell over. Two towers were 16 and 18 years old. In Saxony a broken rotor blade initiated a chain reaction. The machines are designed to last 20 years.