I have a Roku3 which works fantastic & have recently got a Chromecast mainly for BBC iplayer. I control the Chromecast through a Samsung TabS. I have no problem watching BBC on the tablet and I can also get the chromecast to work providing I swicth it off & turn it on when I want to use it. On the tablet I get a google play services error code  15 if I try to use the chromecast when left on for more than a few hours (only with BBC). Clearing the Google Play & Services does't make any difference nor does using Fake GPS
I use Unotelly & have router linskys X3000 (Hall) linked to a Linskys Wag120 (Lounge) The home is ethernet cabled through a Lynxnet Box.
Any suggestions or do I need to use a wireless VPN with a dd-wt router?  Thanks