As an update, I changed my VDSL-modem and decided to test throughput again.
Well, the result is the same as on my earlier 890l, QOS-page again is not saving the changes xD
The settings are ok for me at the time, though. So I don't believe I'm bothered to do a new RMA-run. If I need to change them, I just reset the whole machine and setup it again
![Shocked :o](http://forums.dlink.com/Smileys/default/shocked.gif)