@Alektrum I have tried deleting all the cameras and adding them again, and it worked! Thank you very much.

@Alektrum I have the same problem after updated to 'vigi c340 2.0 2.2.1 build 251218 rel.66582n'. I use 4 Vigi C340 connected to a Synology NAS DS223. I have tried disabling, rebooting, and not yet...