This has become more common, im getting it too. Check the forums, there are plenty of posts where people have had their boats taking 10 ticks of damage no matter the weather, in the middle of the ocean, and at regular intervals.

It happens on the server im hosting and makes it almost impossible to travel more than a small distance, it ticks down like a bomb.. its a latency issue of some kind but i have no idea how to fix it. You can be in the middle of the ocean on calm water and hardly moving and it literally bounces.