I've a Sony Bravia X8500F and I use Spotify constantly for hours every day.
The issue is that, every day, after few hours of listening, Spotify starts to freeze and then freezes the whole TV, remote doesn't work anymore, I can only unplug the tv and reset it.
If I kill the Spotify app when it starts to slow down, the TV become responsive again, so it's definitely a Spotify issue.
I've a family plan and use Spotify connect with 3 accounts and switch between them quite often.
The TV is updated with the latest AndroidTV OS (I think 8?).
Let me know if you need more info.