Tag heuer carrera - does not work timely !!!

Question

Dear,

I have just purchased a TH Car and winded it for the first time 45 times. However, after 2 weeks the watch still run slow meaning that it is off 5 to 20 minutes a day. How can this occur ? Is there a fix or do I use the TH wrongly.

Many thanks in advance for your responses.

Best wishes,
Filip