I'm having the strangest issue
 

So here's the deal I have an 03 coupe and an 02 xterra which have the same security systems. Same key fob etc. and apparently they run on the same frequency which I've been told is rather rare but anyway they do so my g fob can unlock and lock both cars which at first I thought was great only having to carry one fob but now any time they're in the same place (my driveway) they set each others alarms off randomly even when neither of them is locked. Mostly when I get into one or take one the others alarm will go off (like its jealous that I'm not taking it) for example yesterday i got out of my g leaving it unlocked to put something in the xterra which was also unlocked and as soon as i opened the hatch of the xterra my g's alarm started going off and im like wtf? but they also just do it randomly when I'm not even there but neither of them have any issues anywhere besides at my house. Anywhere else the systems function as they should but at my house they go crazy. I've had to pull the horn relays to keep them from upsetting the neighbors but I still have no idea what could be causing this. Anyone have any clue?

Easiest fix would be to just get a new key fob (less than $15) and program it to the G35. I believe it comes with instructions to program it, but if not, follow these here:
http://infinitihelp.com/diy/common/i...am_key_fob.php

I've already done that but I believe it's the cars themselves rather than the fobs I could be wrong though but I have a total of 4 fobs between the 2 cars and they all work on both lol