Alarm malfunction!

Hi there
I just bought a used 2005 Micra, 1.4 petrol, Automatic, with keyless entry and start.
Since the first day I had problems with the alarm. Sometimes it would not go off even when I unlock the door with the remote (all door unlock, interior lights turn on) but when I open the door the alarm sound starts immediately and it is difficult to stop it.
I tried to replace the battery of the key fob and it seemed to work the first days as I had no problem with the alarm going off without a reason. After a few days the problem happened again.
Has anyone had this issue before?
 
Top