I'm using this car since 2016 and this issue wan't there when I bought it. This started suddenly little by little after a two years back. However the only parts I replaced are, all three mounts (Toyota Genuine) and I didn't do anything since I bought this car except general services until this issue started. The mechanic changed the gearbox, but the issue wasn't resolved. Gearbox replaced by Sampath motors. Also I visited Mr Dhammika (Cotta rd), he checked ignition coils and full scan. The only issuehe found was the temperature of gear oil is little bit higher than normal. This is why mechanic decided to replace the gear box.