I have exactly the same problem with my central locking on my B7 A4 and i've not even fitted the RNS-E yet. Looks just like a general fault!
Sorry to bring this thread back up.This is a known problem on the B7 - nothing to do with the RNS-E.
Early B7s were sold with faulty keys - as mentioned by jakerade there was a recall to sort the problem out.Sorry to bring this thread back up.
If it is a known problem, then where/what exactly is the problem?
Thanks.