Hi all, just a question, when I'm the 737NGX at 30,0000 (which is low for a 738) the top speed is only 310?, I don't think that's right somehow. I see 738 on flightrader24 at 39,0000 at a speed of 450. Any suggestions on what could be wrong?, I've tried it in all kinds of weathers and it's still the name. If I go over the limit of 310 the aircraft starts to jump around the place and swings back and for.