Hi, the panic alarm on my 2002 A4 is acting weird:

1. Panic alarm goes off every hour for 30 sec when alarm is active there are no lights flashing.
2. When press panic button on remote only makes the lights flash and there's no sound.
3. When lock the car using the remote the red LED in driver's door stays solid on for 10-15 sec after that starts blinking.
4. As a workaround I leave the driver's door opened during the night for my neighbors's sake.

Note: 1. There's another thread about the 4 beeps in the factory siren signaling the siren battery is low probably dead. Also noticed that 3 years ago ignored and went away.
2. I looked in the repain manuals but there's nothing about this siren.

Any help/hint would be greatly appreciated by me (and my neighbors).
Thanks in advance,
Mihail