Does anyone know why the spark crashes into thing so easily while in gesture mode??

Not all the crashes have the same reason, it needs to be analyzed case by case. If you have the same problem, please don't free to contact DJI support for the data analysis if the drone is still under warranty period.

ok will do!

some things just don't work . the Spark like any other mass produced  electronic device will have a small percentage of things not work as described .   have you ever noticed that no two  items work equality  , computers , TV's  and other electronics  devices , that's just the way it is . personally i fly just my Spark  and don't use all the features . if you can live without the gesture mode fly it and if a new update comes along try it then   . if it means having some one take my Spark apart and have something put it back together , not my best move . now this is my personal view  , do what you think is best for you .
fly safe