It seems to be a strange message to receive. It might be that they were attempting to dwnld at or above your max upld rate (whatever that might be, ltd/unlimited). And there might also have been others attempting to dwnld from you but were unable to despite a slot being open, there was not enough bandwidth left for them. Another option is both your upld (& maybe) dwnld bandwidths were taken up & your searches/forced resumes conflicted with your upld bandwidth. This seems to be more likely a reason. This is only a suggestion & I might be wrong.