Can't Cast to my Nexus Player

Hey Everybody,
just purchased a Nexus Player and need some help.
Google Casting doesn't work as it should. It appers in every Cast-Enabled app, but it won't connect.
On my Chromecast everything works fine.

It worked on Lollipop but after the marshmallow update it broke.
I'm now on Android N beta and it still doesn't work.
The Google Cast Receiver is the newest version 1.18.55065

I can connect youtube (but only sometimes)
Google Play Music and almost every othet app won't connect.
Netflix connects, but there's always a problem when i try to start a stream.

I can't even watch Netflix from the Android TV itself.

- factory resetted 3 times
- deleted appdata of google cast receiver
- uninstalled google cast receiver updates
- force closed google cast receiver

I don't know what to try.. my next step will be, to download the Pure Nexus Rom from xda..

Could it me a problem with my network? i would not think so, because my Chromecast works perfectly.

I would really appreciate it, if someone could help me ;)


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