Since you are always closing issues after asking the same questions again and again, please see prior posts.
Spotify for android doesn't always find the chromecast device, other applications ALWAYS finds it. Restarting spotify helps (sometimes a force stop is needed). This is really annoying and clearly a bug.
Android version is stated in one of the prior posts.
I have restarted, and also changed, the access point.
The problem occurs on two different brands of android phones.
I have no offline playlists.
Removing and installing spotify again doesn't solve the problem.
Please stop trying to delay this issue by asking the same questions again - I do not always have time to answer them daily.
As we haven't heard anything back, we’re going to close this for now 🙂