This can be an individual issue, but I didn't give up my home address back in Poland, where I come from. I checked with the insurer and they do not care if I'm out of the country 300 days throughout the year. Insurance is valid, including the casco, but not the Assistance which only covered Poland.

It's a matter of being aware what you can and what you cannot legally. Insurers have different rules, and there's a lot of money to be saved here, especially in the first months in a foreign country. In my case a full insurance back at home was approximately 5 times cheaper and was far more advantageous (no "franchise" etc.).