1. The WLAN stops working every few days. In particular my laptop does not get an IP address up to the point that I am forced to reboot the router to make it work.
The WLAN is encrypted with a WPA2 Personal, TKIP+AES.
2. NNTP (Newsgroups) connection most of the times do not work: my usenet client connects to the server, gets the messages list, but when I click on each message nothing happens (see attachment: it is a log generate by the client, Thunderbird). This happens most of the times. Sometimes rebooting the router helps, sometimes it works spontaneously.
I have tried a different client, I have tried from a different computer: same issue. I have connected my computer bypassing the WRP400: the issue disappears.
I have done a reset and I have reinstalled the latest firmware: the issue persists.