Recently, my 9 Week Old Sun Conure hasn't been listening to the step up command. I taught him the command at 7 ½ weeks old and he was doing it perfectly fine until 24th December, where he just stopped listening. I'm not sure why he is doing this as we do it all the time. Im not sure if this is a possible cause, a new Sun Conure was introduced into his environment, however they seem fine together. (They aren't fighting and they understand sharing between their food)