The main neutral connection should be tight and corrosion-free; a jeopardized neutral can cause voltage imbalances

https://eduardoyegs715.scriblorax.com/posts/electrical-panel-101-security-capacity-and-code-compliance

The main neutral connection needs to be tight and corrosion-free; a jeopardized neutral can cause voltage imbalances, damaging home appliances and delicate electronics.