Sometimes, there is an absolute limit on the number of terms an officeholder can serve, while, in other cases, the restrictions are merely on the number of consecutive terms.
For example, Maxwell's Equations would always be capitalized, while quantum mechanics is usually un-capitalized. I searched half a dozen sites for an answer to this but found no clue about a rule. So go either way that makes you happy, but (most of all) be consistent.
Is an example of change. A quantum leap is jumping from one understanding to another. The student finally understood the difference in verb endings for the past tense and a quantum leap was made in his ability to understand and speak intelligibly. Vast progress was made when an impediment (obstacle) was removed.