quick update on my rear door issue: The mobile service guy came to my house, it was a very quick appointment, nice work from Tesla. As
@miggz410 said, it's the rubber/gasket door that causes the issue and so it also could be the pressure in since we tried to open the door on the other side then we did not have a closing issue. Anyway, the service guy thinks it's a brand new rubber that causes the issue since it's too stiff/hard, and he thinks it will be soft as time goes by, hence it will solve the issue. The issue is not that bad, I can close it with more force, so we decided not to do anything and wait and see what will happen a few months from now. The service guy put down the note, if a few months from now we still have the issue, then I bring it to Tesla SC to fix it for free. I think this might be a common issue for the new Model Y, other people have the same issue. Is not that bad, you can still close it with more force, but it's not as smooth as other doors.