I have two of the Kwikset locks. The first is located about 10 feet from the XT console with the signoal passing through through a bathroom. The second Is on the terrace level but is probably only 10-15 feet from the Simon XT.
The only error I get is "Malfunction" on the second lock. Occasionally it will work and send a signal, and behave for a bit. Lokcing fucntions seem to all behave normally otherwise.
How to you get more detailed information on the nature of the Malfunction problem.