Metanet Forums

I've never posted here but I've played N pretty consistently for years. I beat all 500 levels years ago and then I woke up one day and all my progress had been lost. I was pretty pissed but I just kept playing and ended up beating nearly every level again over the past year or two. Today I opened the game and once again everything is gone. It's just like I downloaded the game for the first time. I'm assuming there's no way to get everything back but does anyone know why the hell this happens or how I can prevent it from happening in the future? Thanks.