Whenever you argue about the small things, whenever small things seem to be a little off, whenever the small things seem to be the problem it's usually the big things that are not quite right that are starting to peek through.
So don't try to focus too much on the small problems and instead try to find, understand and fix the underlying big problems that are peeking through.
Do it before the big problems are what you're talking about.
Because once you're starting to talk about the big problems it's usually already too late...
[Related: I stopped giving a shit a long time ago]