Contact sensor goes offline. shouldn’t I get a notification that something went offline?Contact sensor goes offline. shouldn’t I get a notification that something went offline? I can see when it went offline in the history but my first indication was when I tried to arm the system to go to bed. asked me to bypass a sensor so I had to see what door I had left open and discovered the sensor was offline. I suspect the battery died but I guess my concern is that it was documented in the history but I wasn’t notified.