Portugeuse Chronograph

Dear all, I have a question. I have a chronograph and I am ofcourse very happy with it, but... Every 2 weeks it's about 5 minutes behind... Is that normal?

Welcome Bas, and that time performance is not correct and should be between 0 to +7 secs/day.

Thanks Dave, it still has it's garantee from last full service so I will return it for inspection. Thanks again!