Hi, has anyone had any issues with casting to shield? Sometimes it workd flawlessly, but most of the times I am not able to cast. I can see Shield as a casting destination on my phone but I cannot connect to it. I have tried two separate phones and two separate apps (Youtube and Google photos).
It could be your router. Some routers (such as ones rented from your ISP) are shit and do a poor job of letting Chromecast protocol from working right.
Google your router model and Chromecast and see if anything comes up.
This was my problem . I had an Arris Modem (which also had built-in router and wifi 802.11AC) and it was notorious for Chromecast traffic not working. I've since replaced it with a dedicated cable modem + apple airport extreme AC