I can think of some communism problems that are not capitalism problems. Central planners causing famine that kills millions not once but twice that I know of. Also reports from communist nations sound like living under communism sucks balls.

I suppose the Nordic socialist democracies are pretty nice. They probably have birth rates below replacement levels as well though. It turns out if you offer women the choice to have a career, enough of them take it that you drop below the replacement rate.