I am also having similar problems. The tab where I've chosen the video, that I stream to my chromecast crashes usually after 5-15 minutes. The tab just disappears and reappears with blank "new tab". So I assume that videostream crashes. I've tried different Canary builds, fixing my McAfee antivirus (I read the instructions I found by you, but they werent perfect, but I suppose I made it right), recovered my chromecast to factory settings, recovered my Netgear router to factory settings and even reinstalled the whole windows 10 (This problem really annoys me and I had some spare time.....). Anyways, nothing has helped.
First time this problem occured to me was about month ago.
E: My comp specs are are following:
Intel i7 4770k
Nvidia GF GTX 780
8GB of ram
256GB Samsung ssd
Windows 10 pro 64bit