Thanks! I just checked and that is set to "Normal", but I remember it was set to "Aggressive" before my last round of getting out of the condition. I will watch to see if it happens again now that "Normal" is selected.
If you want to test it, power cycle your modem, and see if the router succeeds in obtaining a new lease. Note that in Normal mode, it can take a few minutes for this to occur - give it a good 5 minutes.