As it happens I also complained that my screen freezing twice, which then had to be restarted during the exact same flight (LX180/LX181). I also included some other complaints about the desolate condition of the plane (for example no running water in the bathrooms!).
I chose the cheapest available flight in Y and still got 100 Swiss francs in compensation. No status either. I am happy with the compensation I received, but I don't think I would be happy in your friend's case.
To be honest, I don't think they even fully read my complaint, as it seems that I just received a standard e-mail reply.