I mean, they warned you. Apocalypse mode isn't simply "disaster level 4 with the climate modifier and late game comets", it's "disaster level 12". I think that's intentional that the disasters are wild, with volcanoes going off all the time. My bigger problem is that I feel that they increased the disaster rate without apocalypse mode. I tend to like to play on 3 and it felt like things were going a lot more than they used to, pre-patch.