I believe the answer is: The tenure of membership
Tenure indicates the condition that must be made for members to maintain their membership within a certain group/organization.
Your membership would considered as unstable if you're failing or barely made the minimum conditions for that required by your group.
A young woman hears cicadas chirping outside of her window, the last time she heard this noise, she was a teenager in middle school (about 13 years ago). the fact that these insects emerge every 13 years is due to the fact that cicadas have annual clocks.
Taxes and they did not agree with some of the issues that were pointed out to them