Well, similar thing happened before on the DA18-55mm WL kit lens only. However, it is the first time it happened on the DA2470 right after the last FW update.
When looking at the lens from the front, can see the aperature almost "close" but I did not have a photo showing this.
When using AA battery now it seemed OK again. Seemed there could be some bug in between the battery detection/ aperature control or shutter control