Recent work has suggested that issue ownership has a competence and an associative dimension and that both dimensions are less stable than originally assumed. This study is the first attempt to directly compare the stability and change of voters’ perceptions on both dimensions. Using data from the 2015 Swiss Election Study, linking data from a combined panel/rolling cross-section survey with an extensive media analysis, this study finds that voters are more likely to maintain their issue ownership perceptions if the party they identify as the issue owner before the campaign receives a higher share of media campaign coverage. This stabilizing effect is conditional on the importance of the issue for the voter, and it is stronger for voters’ competence evaluations than for their party-issue associations, which proved to be more stable. Thus, the results confirm the literature’s previously untested assumption that voters’ associative ownership perceptions are more stable than their competence ownership evaluations.