new superb 1.9 s

just thought id ask,does anyone sometimes have trouble selecting 3rd gear in this car.mine is only 3 weeks old and sometimes when i try to put it into 3rd gear it just wont go in.i have to pull the gear stick back to neutral and try again before it goes in.also does anyone know how to disengage the seatbelt alarm.im a taxi driver and when the front seat passenger doesnt put their belt on the alarm does my head in.is there a fuse or something that can be removed?i know its there for a reason but im sure other taxi drivers can relate to this.