This is entirely possible, you could have 5. Its not likely the CA door handles are creating a problem, unless you have a fault. I would say make 100% sure you dont have 10 tracking units installed, as it seems when cars change ownership, there is no control to ensure older units are removed, which means they could be there, like leeches, drawing power and trying to communicate out, when on the receiver side, they have been disabled.
Also, someone with proper diagnostics can help you narrow down the fault if it isnt the million units from tracking companies.