The advance of innovative photovoltaics based on hybrid perovskites is currently forced to face their stability and durability through the rationalisation of the phenomena occurring into the lattice under conditions which mimic the material operation. In this framework, we study the structural modifications of MAPbI3 layers by in-situ structural and optical analyses upon recursive thermal cycles from 30° C to 80° C in different annealing environments. We reveal an acceleration of the material modification, above what expected, as the threshold of the ...