A/B said quite some time ago (probably in this thread) that the BA probes were not offered as a solution to the icing of the AA probes. It was assumed by some that this was a weasel way of fixing the problem without warranty cost, and operators like AF proceeded to replace the AA probes with BA at their own expense.
Now, we see that A/B was honest: the BA probes are not the cure. It must be an aging or corrosion problem with Thales probes.
GB