hi there! i just bought this plane! and is awesome! but I just got a problem, in the first flight that i made, it was ok! but today i just went to fly! and after a random period of time! when i am taxiing, or just after take off, the FD, AP and NAV stop working! i just cant change mode select on FD, the plane doesn´t follow HDG, or ALT hold, and can´t change NAV FREQ, is something that i am missing??? i reinstalled it and didn`t changed,  also i was having a sound problem but i just reload the plane and i can hear everything.  hope that someone know something about this!. Greetings.