Ours are doing this on flat ground. I don't have much if any issue on hills, less so than on flats. The hill-brake doesn't impact it.No the easiest way to reproduce is to pull away from a hill. Whether you're in D or Sport or Eco has no effect on the behaviour. It's most likely a bad mechatronics unit but unless it completely craps out, it's too intermittent to diagnose. My VW mechanic friend said it's highly likely it's the mechatronics too if brake hold isn't interfering with the DSG behaviour. Which in theory makes sense since I never had these issues in my first year of ownership and only now is it getting worse.