Portuguese chronograph power reserve

Hello.
I just bought a IWC Portuguese Chronograph IW371401.
Most evenings, after letting the watch rest for one hour in the table it stops!
Could there be something wrong with the power reserve? What is the most common cause for this to happen?

Thanks for any comment.

Did you wind it before wearing or just rely on your movement to power it?

Well, I did wind it... but in rest it seems to stop usually after one hour.

If after winding fully, fifty turns or more, and it still stops, then something is amiss. Take it to your AD for an assessment and possible correction by IWC.

Yes, that is probably the best - will do it tomorrow.

Thanks.