Been using chrome casting for year.
I mirror my phone on TV.
I used to use a Samsung Note 4. No problems.
Now I use a Samsung Galaxy S9. Since the last two updates for Samsung I am unable to see my device on the network unless: I search for the device, lock my phone and when I turn it back on my s9 has found it.
Since the last update when I screen mirror my phone the video is laggy. This was not a problem before. Why are updates making the technology getting worse. Stop breaking thinks than don't need fixing.