Just signed up to forum. Been looking for answers to the 825 lockup problem. This helped sooooo much.
I have a basic config with a DSL modem, the 825, and a series of wired and wireless macs and a pc or two. I've had to repower the 825 now on a daily basis. really frustrating.
The fix of turning off the DNS Relay seems to have solved it. I've been running for 4 days now just wonderfully, and faster. I have yet to see any side effects of this, but for now this seems to solved the problem.