Roberto –
It appears there is a bug in the Android App that is making it so you are not able to save the toggling off of the auto arm. There is work around while we get this updated. You can set the auto arm time to be 12:oo AM. Setting the time to 12:00am in the Auto Arm settings will cause the system to disable it.
Our app devs are looking into this and will get a fix published. I appreciate the feedback.
Thanks,
Mike