Never. And repeatedly.
Theoretically never. For me the fun of the game is playing whatever hand you get dealt. I even like the challenge of playing out of a difficult start.
But . . . after I've played a long game through to the end, I go through start after start as I'm beginning my next game. No start pleases me. It's not that I'm looking for a better start. Like I say, I'm happy to play out of a difficult position. It's that being at the start is frustrating to me. I miss my battleships from the last game.
I take a deep breath, say "I'm playing this one out to the end regardless," roll a new start and then I start playing that one. I just have to be really ready to start and then I'll take whatever the game gives me.