iOS "could not connect at this time" when editing scenes

When editing scenes on iPhone (5SE, iOS 11.1, vera app 3.8, vera Edge firmware 1.7.3232) I always get a message that it “could not connect at this time”. I didn’t get this on the previous version of Vera on my ipad, but now that I updated the app to 3.8, the error is also on the ipad. The error happens on any scene, not only geofencing scenes.

The scene changes seem to work anyway, and I can see them when I check on the web UI. I don’t get any error if I edit scenes using an old android phone (Vera mobile 7.23.16).