I ride a Kymco ck125 and say I am in 4th or 5th gear and a stop is coming up I hold in my clutch and brake then go down the gears until I stop. Thats all good and fine but if I wait too long and try go down gears when I am almost stopped or completely stopped my gears lock up and won't let me gear up or down. I have to rock the bike backwards then go down a gear then rock it backwards then go down a gear ect. is this normal??