Startup freeze with multiple motors

[Cdfghglz]

Hi

Some 70% of the time, the first motor that is called from EthercatMaster's startup() gets stuck in the state 4 - SAFE_OP.

There are no errors on the motor, but it does not react to any subsequent state change attempts. Also it seems to break the communication as the working counter is too low afterwards.

The issue is present with >12 Maxon controllers. I can not reproduce the issue with <12 motors.

Any ide what could be causing this or how to debug? Thanks!