Interesting...At Porsche Amsterdam they were the ones who were insisting to replace the unit whereas I was conservative as I was not convinced that that was the cause of the problem. I thought it had to be a software issue and not a hardware failure, the car was just 3 days on the road, so...
I had the same issue a few weeks ago. Long story short: Porsche Centre Amsterdam replaced a faulty control unit (regelapparaat) and quote/ unquote: ‘resetted the Com box behind the replaced unit’. Works fine ever since.