u/Artistic-Intention31

Today I came back from two weeks of vacation, I lost one of my axolotl in the half of my trip, I sent some friends to lower the water temperature, which had risen to 32°C because of turning off the air conditioning before leaving, it goes down to 20°C. When I came back today a second axolotl was dead, they were 2 years old and all my parameters are perfect, what it could be ?