Zwave after heal: Node is not communicating with controller

Is this recommendation still valid? I recently updated to Snapshot 1731. Since then, all my 3 battery powered devices are going crazy. After each heal, it says that they are not communicating with the controller. A manual heal brings them “online” again, but “last heal time and day” is not updated. Previously, these ran 10 months uninterrupted. Had set a daily heal that always worked. Btw, I did not move any device just one millimeter from it’s place.