Solder, battery, whatever. I have the same issue and need to fix it.
But what is the logic behind that alarm going off in these circumstances? So what if you used the fob to lock it? Why alarm when a key is used later to open the door? Absolutely totally *&%$ing lame!
Mean N/A '07 pretty much loaded.
Mods to date: Kappashere CAI, billet grille, Helo rims, built-in garage door remote, JPM leather covered tulip (trim over waterfall), interior de-silverization including body color boomerang, radio, switch bezels and door hardware, retro gauge overlay, Halo DRLs, headlight bezel blackout, SOLO dual axle back exhaust, mesh rear fascia insert
Next up: final exterior de-silverization (windshield trim)