Default [Q] Moto G - Google Play Music problem after latest 4.4.2 fix

I just wanted to know, if anybody else is experiencing this and / or if you've found a solution:

Since the last update that was supposed to fix connectivity issues on 4.4.2, I get the "unable to play the track you requested" when streaming music from my Moto G to my Nexus Q (via Cast-to-upnp and bubbleupnp server).
This used to work without probs prior to the update. Now after 30min to 1h of streaming, I always get that error message. I then have to close Play Music, restart it, reconnect to my Q and it will work for another 30min or so.

My HTC ONE GPE (4.4.2) and Galaxy Note 10.1 (CM 10.2) don't show this behaviour. So far I've tried the following on the Moto G:

- Re-Install Google Play Music
- Clear media cache
- Disable 2G/3G connectivity

Any help very welcome!

Thank you for taking the time to read this.

Cheers

Tobi