Hello AVerheij,
We are currently investigating Bluetooth performance and will be releasing and errata that will provide further details. There will be a new hardware revision due to this errata and you will be able to replace your hardware under RMA once the new hardware is released.
Also, I have started a FAQ that will discuss Bluetooth testing. To see this article go to the following link:
http://tdg.logicpd.com/viewtopic.php?f=52&t=16554