High CPU usage
After pairing the Android app on my Nexus 6P running December update, to my computer running Windows 10 Pro desktop, I noticed one of my cores was always at 100%. When I killed the chrome tab using that process, the videostream crash notice popped up. Restarting it stopped the high usage for a time, but it always came back. Unpairing seems to have fixed it. I can provide more details if you need.
Is this when you are playing a movie? Videostream will transcode videos that won't natively play on chromecast, this is very cpu intensive.