The firmware that I linked to a few messages ago is the official Netgear firmware, and I've no personal experience of it. The current DGTeam firmware, which I use, is based on an earlier version of the official firmware, so the later version may have improvements in the ADSL driver, but I don't know. However I don't think it's got anything to do with your problem, which is related to the link between the exchange and Zen; it may be the result of BT activity, or it may be caused by Zen, and really only Zen can help you get to the bottom of it.