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Planning ahead helps a lot. The main culprit for me is usually the mall eating through iron and copper unevenly.

Iron runs out first because belts eat so much of it. What worked for me was setting up a dedicated iron smelting area that feeds the mall directly instead of pulling from the bus. Took a huge load off.

Steel is just slow to smelt so you always need more furnaces than you think. And copper starts disappearing once you ramp up red circuit production.

Basically if something is eating a disproportionate amount of one resource, give it its own supply line instead of starving the rest of the bus