Originally Posted by kq747

I imagine it is sent when the change happens and based on some reports it can of course change back to qsuite so if you have time it may be worth waiting to see if does get swapped back instead of changing your itinerary. I imagine to receive the email, you need ensure your contact information tied to a QR PNR so they can reach your. I doubt the avios team would send this out. And as always ExpertFlyer can also alert you to a change

Here is a sample:

Dear Customer,

Due to operational requirements, your flight QR3 DOHLHR/18Apr originally
operating as Qatar Airways Qsuite has been changed to a different
seating configuration. Despite this change, our award-winning business class
experience will remain the same. You can review or reselect your
preferred business class seat by clicking here.

We do understand that you might want to change to an alternative Qsuite
operated flight and we are ready to assist you with one free change. Please
get in touch with our customer contact centres to discuss this option. Our
contact numbers are listed here