Sigma alarm beeping after locking means theres a door/boot/bonnet still open somewhere, Double check all the doors etc spray wd40 on em, usual sign of this is also interior light stays on,
Does the alarm have the mini keypad on the windscreen, if so you can disable certain swithched and find out which one it is,
Mine occasionally does this after heavy raind/washing when the doors have been open for a while
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