koobas.hobune.stream
reflections broke after updating from 5.4 to 5.5
pink-purple spots over reflective surfaces both in new and old reimported projects. disabling reflections removes the spots. also, i don't remember ever touching anything related to reflections, if that matters. 
Best Answer
found a workaround in another thread on Unity forums - go to Scene - Environmental Lighting - Reflection Source - Compression and disable it. 
