my boat keeps disappearing when I'm driving it

Boat disappears

What I expected to happen was...:
Thought I'd still be able to use the boat

What actually happened was....

In the middle of driving the boat it made a horn sound and dissolved 

Steps to Reproduce:
1. Playing Seaside Story in Minecraft 
2. Upgraded my boat ... drove it around a little 
3. Went t change directions... boat horn sounded.. boat dissolved into shimmering air.