2007 Volvo S80 rattle in front and also snow tires

When I purchase the used volvo in Sept. I noticed a rattle in the front and was more noticible when driving slowly. The dealership under warranty replaced the tie rod (left), replaced left front shock absorber and also ball joint kit. These were done under all separate appts as they problem still persisted after each one was replaced. Each time they did the repair it seemed as though the problem was taken care of but then it returns. Do you have a suggestion as to what they should look at next?

2. AFter purchasing Snow tires from Kost when the car is COLD there is a significant vibration that comes from the front and goes away when the car is warm. Is this normal with snow tires.

My email is sostowski5@yahoo. Com