I suffered from this also just recently having initially setup notification on some key switches. The only way I could make it stop was to re-create the notification (even though there appeared to be none in play) and then delete it again, that seemed to work eventually for me.
Could you please enable Verbose Logging and Lock Log Levels from Settings → Logs and send us an email to support@getvera.com specifying the name of the device sending those notifications as well as the time and date ?
Also please enable tech support on your unit and copy-paste the generated access code to that email.