Since last update, I randomly end up in boat. It doesn't matter if I am inside my house or running through field, though it seems to happen most frequently when I'm inside structure. It also frequently happens if I exit and return to the game during daytime. It is similar to the way you pop out of bed automatically in morning, only in this instance I am randomly popping into a boat.
I am currently playing in survival mode -(but have switched to peaceful since this started happening)