alarm arming spontaneously

We had our system arm seemingly on its own yesterday. Anyone have this problem before? I'm guessing it has something to do w the A/B data from the OP2 to the expansion enclosures and consoles. Any ideas? Can doubling up the conductors to the expansion enclosures and consoles improve data flow?

And your system is a ___________. (Fill in the blank)

OP2 Leviton

Data flow is not the issue.
 
I'd look at arming methods or interfaces to third parties.

Thanks guys. This hasn't occurred since I eliminated a bad wire from my data buss yesterday. Also, as per DEL's comment, I made sure that there were no loose ends in the phone menu. I had armed the system by phone earlier and I was thinking that may have had something to do with it.