
This is indeed not good but for us unsure why it does freezes actually... it works fine on my windows so it is difficult to recreate your problem.
Could you try to install the very latest version of the client, making an executable by the instructions from here: https://github.com/bitcraze/crazyflie-clients-python ? There has been some fixes to the very latest version, which might have already solved your problem.
(btw, just letting you know that for the next two weeks, we will be a bit slow with answering the forum due to the holidays!)