my 777 is sinking

Hi guys i have a little problem here I hope you will be able to help me. What happen is I can't land the default 777. each time I try it just sink into the ground and crash as soon the fuselage touch the ground.
Now I did some tests the 777 is the only one with this problem and it happens only if the wheels take a hit (ex. landing or when I decided to bring down the nose on take-off) and on any airport
I hope you will be able to help me thanks in advance
p.s you wanna know what is funny? I discovered this at the end of a 5 hours flight
Now I did some tests the 777 is the only one with this problem and it happens only if the wheels take a hit (ex. landing or when I decided to bring down the nose on take-off) and on any airport
I hope you will be able to help me thanks in advance
p.s you wanna know what is funny? I discovered this at the end of a 5 hours flight
