2014 C4 Picasso alarm fault

Hi, my C4 alarm has the following problem.

If you lock the car the indicator lights dont come on to show the alarm is setting and after 30 seconds the alarm goes off.

If you lock the car then unlock the car immediately the car locks itself after 30 seconds but the alarm is disabled.

Any ideas to what is the problem, I have disconnected the battery to see if that cured it but no.

thanks for any help.