Temporal evolution of the PCE, V_OC, J_SC, and FF for Cell 1.2 during the first 600 h. LID happens between LS1 and LS2, LS2 occurs at t = 452 h after light interruption. Notably, simultaneous performance increase and decline are selected across all parameters, reducing the complexity of feasible mechanisms behind instabilities and making the results interpretable. An identical selection and processing procedure was applied to all cells studied.