I have pretty much the same experience with occasional sticking lock but no big hassle we just push button to the side slightly and it pops back out. Same email arrived today.I received official notification from Ineos, Lynn Calder this morning for all door handles to be replaced, yes my buttons occasionally stick after rain, but very easy to manage even Jacquie ( wife ) does not mention it just flicks it out, I will have to look at her technique as she does it quicker than I can, and I thought I was quick, my vin is 9848 so in the mid range of affected vehicles.
They said they will replace the door handles during the next routine work shop visit.