I've noticed my flights next month have had multiple equipment swaps since I booked the flights. The outbound DOH-CAI is now an A320 and the return is a 772LR.

Instead of chasing this each time the equipment changes and selecting seats again, is there some known process by which point QR will no longer be changing the equipment operating the flights?

They're relatively short flights so not a huge issue, but still good to know where I'll end up on which plane.