Hi, I own a 2016 A3 1.4 150 TFSI and recently went for a service and I was loaned the 1.5 TFSI. I found the exact same issues you describe and it also would kangaroo when at low speed in car parks etc. I asked the service receptionist who said he found the same issue and that Audi are aware and working on a fix!!!! I found my 1.4 much smoother, punchier and quieter. This 1.5 engine has been around now for a couple of years and still working on a fix!!!!