Alarm Problem
 

My alarm in 2000-S sometimes works 100% and sometimes not. When the lock button is held down it closes the windows(if open) and other times not. The hooter also sometimes beeps when the car is locked with the remote, but mostly never. The hazards always flash as they should. Unlocking/locking works perfectly with the central locking using the remote and remote doesn't work after 3 days as it should.

Any ideas?