I just purchased the router less than a weeks ago and have called Tech Support twice already. Its a DIR-825 rev B. and 2.02NA firmware. My connection seems to slow down from 16mb/s to about 400kb/s after a day or so. Tech support had me change my NTU from 1500 to 1250 the first time and 1250 to 1492 the second time. I have 2 wired computers and 2 wireless in my network. All of my computers also have firewalls which someone told me could be a problem since my router has one too. I have a Motorola 5101 modem. Someone please help.