Hello there ...
I have just recived my
second DIR-855 - because the first one did a wireless lockup.
This one is doing the same!!!

Not so nice when you are streaming music or video from the Internet. (or your own network)

I called D-link support in Denmark ... they told med to un-chek the QOS in the router ... and viola!
No more lockup!!!

In your DIR-855 Router: You go to ADVANCE, QOS ENGINE, remove the checkmark in "Enable QoS Engine"
I also un-cheked: "Enable Traffic Shaping"
Right now 5 PCs are streaming video and music from the internet ....
Smoothly!!!

Kind Regards
Pierre