I have a 2017 Rogue SL. Twice in the last year and a half the backup camera has broken loose from the clip that holds it in place. The camrea works as when I put it in reverse I can see the inside of the rear liftgate. The delaer fixed it no charge a year ago. Now they want $620 to replace it. I was wondering if any one else is having this type of issue and what have they done to fix it.

That's ridiculous. That part is integral to the vehicle, so shouldn't it still be under warranty? Check your warranty info booklet, it should contain the most accurate information. They shouldn't charge for any defect that was not due to neglect or normal wear and tear. You might be better off speaking to a different dealer.