They break and old ones were brittle from uv or age. My last one had a cat foot sized hole in it one day, it went in the trash a few years later. The 10-10 is a real pain in the butt if dust collects.
A good way to prevent that on any plastic part is wiping it down with 303 Aerospace Protectant, which works wonders on any plastic, resin, or rubber. That, and avoid extremes of temp and especially UV light. Sunlight is not good for plastics.