They often find themselves feeling as if this lack of uncertainty has led to a degree of stagnation. while they enjoy the stability that certainty brings to a relationship, they sometimes wish there was more uncertainty to keep things fresh. what phenomenon are erick and ellen experiencing?

dialectical uncertainty

Explanation:

Relational dialectics is an interpersonal communication theory about close personal ties and relationships that highlights the tensions, struggles and interplay between contrary tendencies.The theory, proposed respectively by Leslie Baxte and Barbara Montgomery in 1988, defines communication patterns between relationship partners as the result of endemic dialectical tensions.

(Source https://en.wikipedia.org/wiki/Relational_dialectics)

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )

its d i know cause i've been googling it