Ungo ms-2000 going off every 20 minutes

I currently have a clarion Ungo Ms-2000 alarm system and and remote start module in my 96 Pontiac Grand Am.  When ever i turn off the engine and exit my car i arm the alarm just as anyone would.  Then exactly 20 minutes after i set the alarm, the alarm goes off.  I bought both the ms-2000 and the remote start module on e-bay and when i recieved them, the alarm looked new(despite the half - destroyed box) and the remote start module looked as if it had been used.  Does anyone have any suggestions to why the freakin alarm goes off 20 minutes after i set it.  The weird thing is i can turn the alarm off once it starts blaring after 20 minutes and after that it won't go off again.96 Grand am

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Audiobahn ABP12 Bandpass

Clarion Ungo Ms-2000 alarm w/ remote start module

I remember if you don't use a diode on the trunk, the alarm would also be triggered every 10-20 minutes.My Personal Installer Note: Connectors are easy, neat, and professional. But do you know how to crimp properly?

I too have an Ungo Security system.  Mine is a MS2004 model.  My alarm system also has major problems, such as: Chirping whiling I'm driving, going off on its own and at the most remote times, very extremely sensitive at times, other times it just won't sound off at all?, etc.  The list goes on.  I got mine installed supposely "professionally".  Took mine to a place called "Sound Solutions" to get it installed.  All my friends took their cars there.  They never had any problem.  I did.  Don't know why, so now I'm assuming Clarion Ungo Car Alarms have problems with them.  Tried emailing and calling up Clarion, but never response.  p***ks!!!  Sound Solutions are still trying to figure it out as well.  My opinion, NO MORE CLARION UNGO's from now on!