I've just received notice that 3 of my 5 segments in my next Ex-DUB flying in November have changed. Apparently BA didn't think my 65 min connection was leaving enough lounge time. It's now just under two hours. Some segments have changed multiple times.
My positioning flight have _all_ changed. I am staying overnight, so no worries there.
I've set up an account with CheckMyTrip, and it seems to have been the fastest to notify me. Even faster than BA updating MMB.