I've been getting a random intermittent beep from the alarm. The car is unlocked in my garage. Alarm telltale light is flashing. Occasionally (spaced 30 minutes or more apart), I'll get a hear a single beep, not unlike the arming sound. Alarm functions as normal when locked. Started noticing the issue after the car was left outside during a heavy rainstorm and the alarm was triggered. Car is normally hooked up to a battery tender, but the condition persists regardless if hooked up or not. Anyone out there have any thoughts as to what might be causing this?