I purchased two 2gig image motion sensors last September. Last week, while on vacation, we received an alert that one of them had malfunctioned. When we returned, the first thing I checked was the batteries in the sensor. They were completely dead (although we never received a low battery alert). I put new batteries in (Energizer Ultimate Lithium, as instructed) and the panel still showed the malfunction. I tried re-learning the sensor at the panel, and that also failed. In a matter of minutes, I noticed the sensor becoming warm to the touch. I immediately removed the batteries, which were also very warm.
Do you have any suggestions?