We apologise for the caused confusion with our explanation regarding the USB issue. With the recommendation to not disconnect/connect the USB stick during a ventilation we are not taking influence on the root cause of this problem, but avoid a possible affection on the patient.
This means: the USB crash can occur randomly at any time and with any EPC module, whether the ventilation is running or the device is in standby mode. But please note that the probability of occurrence is very low.
There is no higher chance that the problem will occur again on the EPC module of your bellavista MB104901 than with any other EPC module. That's why it makes no sense to change the EPC module.