I quite like our Google TV Chromecast too (I think that's the name, the new one with the remote). Our old Samsung from 2013 had a lot of issues, Netflix would stall a lot, and Disney Plus never even released an app for it.
Turns out it wasn't the WiFi like we suspected, the TV was apparently just poorly coded junk. It's smooth playing on the new device (apart from the time it crashed and needed a reboot). My only complaint is that it associated with my YouTube account but it's a shared TV, so the main screen has watching suggestions based on what I have personally watched and I cannot 'log out' of YouTube alone. This is annoying, but it's Google, so what is privacy? I guess I can make a new account.