I have 1Gb/s at home. Somehow it doesn't translate into a reliable streaming service experience. I'm currently subscribed to Disney Plus, and trying to watch

I have 1Gb/s at home. Somehow it doesn't translate into a reliable streaming service experience. I'm currently subscribed to Disney Plus, and trying to watch tv shows via Chromecast rarely works. I even upgraded to the latest Chromecast to try to fix the problem, but it didn't make it much better. I'd trade for a 20mbit/s connection if the streaming services would send me content instead of "an unknown error occurred"