It might be due to summer (warm weather) tires in the cold. My Giulia does the same thing, and I am thinking about all-season tires for winter. The Alfa 4C forum has photos of a Giulia getting all-seasons -- the only detail mentioned was: "Getting All seasons installed today. The Rcomps it comes with really hates this weather..." http://4c-forums.com/8-alfa-romeo-4c-general-discussion/37041-giulia-s-us-landing-11.html I have another car that just does not drive well with summer tires in the cold -- not just for lack of traction, but for handling and issues that remind me of the Giulia shaking. "Performance car" guys might have better experience and advice for you on such matters than the garage. Elsewhere on the internet you will find that some people think summer tires are damaged by cold weather use. Some tire dealer websites mention this. Good luck Filip!