Cognitive control is essential for executing goal-directed behavior and is shaped by multiple factors, one of them being context. Contextual information influences which stimuli features are selectively attended to and prioritized for processing. The context-specific proportion congruency (CSPC) effect refers to the observation that the magnitude of the congruency effect is modulated by the proportion of congruent versus incongruent trials within a given context. Typically, larger congruency effects are observed in contexts with a high proportion of congruent trials (80% congruent) compared to contexts with a low proportion of congruent trials (20% congruent). The present study investigates whether the magnitude of the CSPC effect in the Stroop task is influenced by the frequency of context switches. To this end, we manipulated the switch rate between contexts by creating conditions with either a high or low proportion of context switches (80% vs. 20% switches). The results indicate that a substantial CSPC effect emerges when context switches are infrequent (20% switches), whereas a high frequency of context switches (80% switches) eliminates or even reverses this effect. These findings suggest that the volatility of context transitions shape the acquisition of control policies. Frequent context changes might impair the formation of context-congruency associations and participants may instead form associations at the item level and connect each item with its associated proportion of congruency. These findings indicate that when contexts are unstable, participants may struggle to adapt to conflict and identify task-relevant stimulus features, emphasizing the importance of contextual stability for effective attentional allocation.