We have an issue with one Windows 10 machine casting to multiple Chromecast devices. We have a brand new Lenovo Thinkpad X1, and have downloaded the latest version of Google Chrome. It was recently patched to Windows 10 level 1803 and then 1903.
The Chromecast and the laptop are on the same wifi network. We can see the device and cast to it, but after 2-3 seconds, the video freezes on the Chromecast TV. The weird thing is that Youtube plays fine, but casting web pages or Office docs freezes.
We have a Microsoft Surface laptop which has no issues.
Also we tried this Thinkpad on other Chromecast devices and it does not work, either at work or home. It does connect, but then freezes after 2-3 seconds.