I wonder if this is the season to change flights for Vietnam air.

I booked an award ticket to Ho Chi Minh.
Then separate tix to Nha Trang, and a week later Dalat to Ho Chi Minh.

Vietnam Airlines has sent me email advisories that the first domestic flight time had changed to leave before I arrived in Vietnam. Had to call twice and rebook for a later one (and 5 hour layover now ).

Then another advisory came saying the Dalat flight had moved to 9am. Then 3 days later another advisory tells me it is back to the original time.

Departure is still 2 months away, but I am wondering if this is typical, and when it will stop.