Yeah I had a chat with a Google rep this morning, and it was obvious from the conversation that they're having raids in certain niches these days.
But like aim said - get a new domain and re-upload the campaigns.
I've been doing this, and it lasts about 3 weeks before I'm slapped again. At the price of domains, its still extremely profitable, just a major pita.
I normally just swap the ad url and display url. Don't even bother uploading new campaigns. I haven't tested this vs new campaign to see if I last longer.