Problem mit WLAN (Loewe Connect 26 SL)

Hey guys,

sorry that I write in english. My german is still not so good (especially in technical aspects), but I understand pretty well so feel free to answer in german.

So my problem is as following. We bought new Loewe Connect 26 SL and additionaly the Loewe WLAN stick.

Now I am trying to connect our TV to wireless internet (router: Speedport W 503V - Deutsche Telecom). Well it already worked but always only for aprox. 30 second. After such a short period of time the internet connection is cut off and I have to again enter WPA/WPA2 password.

What I already tryed is:
- disconnect the router from electricity
- restart router
- swich off and on the TV
- to change WPS (automatischer Abgleich) from "Pushbutton-Methode" to "AUS"

Currently still without success and getting little impatient.

What I want to do after (when my TV has stable WLAN connection) is to connect to our home server (I use Twonkymediaserver on MacBook)

I hope I did there everything correct so when the internet connection works I can see my movies/pictures and hear my music.

Steps I did with Twonky server
- instal twonky server
- in the basic setup I requested to share the file I have my music/video/pictures in
- on my MacBook I alowed that the file can be shared in the network

Any other tips what I shall do that the server works properly and I do not get angry again that I still can´t see my videos/pictures and hear my music.

many thanks in advance for any help sugestions.