It is very concerning when you have 3 similar incidents in the same company. There must be something that has caused the difference. I can't imagine that FlyBE work their a/c any less hard than SAS. Could it have something to do wit the conditions that SAS operate them in.
I can't imagine they get any easy time in the winter. Pure speculation of course.
I hope they find a cure pretty sharpish, or it could be big trouble for Bombardier.