02 Sillouette random alarm

Among other problems my 02 sillouette has started having its alarm go off at random times. Like the middle of the night mostly. It sometimes lasts for minutes other times like 15 seconds. I can turn it off with the remote. Why is it doing this? how can I fix this without losing the alarm feature. Has anyone else had this issue? I have seen this on the forums but for different cars and all with different solutions if any.

Thanks,