some problems with the 707. something know how to fix them?

-my airplane often crash (like when hitting another plane) when I perform pushback with engines started

-my aiplane bounch on the taxiway and when it's parked (causing som problems to civa alignment)

-my airplane, when I switch on the doppler navigation unit and I connect it to the ap (nav selct knob), follows the prefiled fsx flight plan... very confortable, but i'm not sure that's so realistic

do your airplanes do the same?
It's really annoying  >:( >:( >:( have a crash after have waited for 30 minutes for the CIVA alignment(and have paid 30 euros) ...