Make sure that you do not have your spyglass in your hand when hopping on the Equus. If you do, it will make you auto-look through it and you won't be able to put it away. You won't be able to see the feed prompt and will be kicked off. This just happened to me on a 150 Day is during x2 -_-
This stinking thing!!! So annoying!!! I was taming it on a cliff and I was a bit slow and it knocked me off. RIGHT INTO A SWAMP. I swear, while everything was eating me, sarcophagus, titanoboa and mega parana, I saw it laughing at me.