I have found a Beta Version of the Internet-Box Firmware. I dont really know how it will work and if its better, but to get another Firmware you can try this oder contact the Service Desk at 0800 800 800 - maybe they can install you an older version.
It seems that only the IBP and the IBS are affected by this bug. It could be that there is a solution available soon. Do not know yet if we will rollout the new firmware or if we share it only on our homepage.
@antric Some customers have got a 10.4 Build. It is nearly the same as 10.3.36 but with a few adjustments. It's a mistake but because the build is as stable as 10.3 we do not downgrade theses boxes.