A method and a radio network node (110) for managing precoder reports from a set of user equipments (120) are disclosed. Each of the precoder reports indicates a precoder selected, by a respective user equipment (121, 122, 123) of the set of user equipments (120), to be used by the radio network node (110) for transmission to the respective user equipment (121, 122, 123). The radio network node (110) receives (202), in a first time interval, a first set of precoder reports from the set of user equipments (120). The radio network node (110) receives (204), in a second time interval, a second set of precoder reports from the set of user equipments (120). The radio network node (110) determines (209) a first distribution of precoders for the set of user equipments and a second distribution of precoders for the set of user equipments, wherein the precoders in the first distribution are indicated by the first set of precoder reports and the precoders in the second distribution are indicated by the second set of precoder reports, whereby a change in distribution of precoders for the set of user equipments (120) is detected. A corresponding computer program and a carrier therefor are also disclosed.