Alarm goes off randomly

[Zordrack]

Soo..

Reached the end of my diagnostics skills on this one.
The alarm randomly goes off for no discernible reason on my 2000 S.
Also. Sometimes it single beeps when you lock it. Sometimes it does not.

Both door latches are new, the ignition switch is new.
I've verified that both trunk and frunk switches reliably turn on and off the lights in the compartments by putting a camera in there and opening/closing them.
Windows drop when you pull door handles and go back up when released.
Limit switches for roof registers full travel in either direction as well.

The alarm module is bone dry as is the compartment that it sits in.
I even removed the drivers seat to ensure that it didn't look like it had been wet at some point.
Found no tell tale signs.

Hooked up Durametric to see if any fault codes were stored in either of the alarm modules.
Both came up clean but maybe I'm holding it wrong.

Checked power and found that the battery was about a volt down from nominal (11.44) so took it to the local parts store to have it checked out.
They said battery was at 75% charge but otherwise checked out fine.
They also checked the alternator and came back with a failing voltage regulator.

Bought a new voltage regulator from PelicanParts and replaced it (along with the belt since I was already there).

Still same issue. Sometimes it'll sit for days. Sometimes it'll be minutes after you lock it.

Nothing in the logs that i can pull with the Durametric and nothing more that i can think of.
It's been about 2 weeks now.

The last few days a new issue has popped up.
Passenger side door doesn't unlock when you pull either inside or outside handle.
Or when you push the central locking button on the dash.
It only unlocks when drivers side door is unlocked, either by opening it from the inside or by unlocking it using keyfob or key.

I'm unsure if these two issues are related and how to proceed.

Any help and/or suggestions would be greatly appreciated.