Insurers identify two issues that could explain the situation.
First of all, building collapses have been more frequent in recent winters due to climate change. In 2019, a report from the Mutuelle des Municipalités reported higher than normal snowfall. This had been trending for 3 winters already: heavier snow and ice loads are damaging structures.
Also, fires are more frequent. These are often of electrical origin. This means that insurance companies are becoming stricter, requiring that work and renovations be done by a licensed professional: farmers must now hire general contractors, master electricians, etc.
We recommend that you consider involving professionals with any major work, in order to avoid unpleasant surprises.