A mechanism for controlling service of a user equipment device (UE), including (i) predicting that the UE will move sequentially through multiple zones of coverage of an access node that operates on a different respective set of one or more frequency bands in each zone of coverage and that has a respective radio-frequency (RF) circuitry quality as to each frequency band, (ii) based on the predicting, determining an RF-circuitry-quality score of the access node as an aggregate of the RF-circuitry-qualities of the access node as to the frequency bands on which the access node operates in the multiple zones of coverage through which the UE is predicted to move, and (iii) before the predicted movement of the UE through the multiple zones of coverage occurs, proactively using the determined RF-circuitry-quality score of the access node as a basis to control whether the UE is served by the access node.