I have been having trouble with DIR 655 dropping the connection on cable modem when downloading email in Outlook on a LAN line. The internet is obtained from a cable modem. This router has had this problem from the beginning. I have upgraded to the firmware to 1.21, 1.22b, and now 1.30NA and it consistently disconnects, and none of these firmware upgrades has made a difference with this problem. If I run the cable modem straight into the computer the email downloads quickly. Is this a defective router?