Yes, there are times when you really want to force a disassociation, if for no reason other than testing purposes. But meanwhile, two parameters you may wish to adjust are output power and Client Strength Signal Threshold. In the example which follows, power is set to medium (higher is not always better) and the 2.4 and 5GHz minimal signal levels are set very differently. This user has IOT devices on 2.4GHz which should be allowed with poor signals (sometimes poor throughput is better than none) but 5GHz is used primarily by phones and computers. The latter is markedly faster and they want to keep it that way by disallowing weak clients.