I've had the same problem. I had mine set to turn off all Internet access to my kids' computer from 8 pm to 8 am every day. Every Sunday Internet access would be denied after 8 am. I'd have to log on to the router and turn off that rule, save settings and then turn it back on and save settings again. PITA.
I now just use Parental Controls in Windows 7 to prevent them from loging on during those times.
On a DIR-655
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Henri