Buick Terraza car alarm problems?

[Bob Loblaw Six]

The car alarm has been going off at night for no reason........also, when driving, the automatic locks keep clicking over and over as if the doors are not latched, yet there are no doors ajar, the dome light also will come on when this happens. I am assuming these two things are related.

I thought it might be the batteries to my keyless entry but after changing them out, that wasn't it.

Any advice? Thanks in advance.