DHCP not expiring and unit needing power cycling

I've had my AirPort Extreme N gigabit router for about two days now and am having several issues. I upgraded to the 7.2.1 firmware, but that didn't help. I've noticed that DHCP leases, after expiring, aren't releasing and therefor aren't allowing DHCP devices to reconnect. The only work around for this has been to blow out the DHCP lease window exponentially. Secondly, are the activity lights for the lan ports on the back of the Unit supposed to remain on? Mine keep turning off and I have to power cycle the unit to get them to come back on...before they turn off again. I've also had issues where Gigabit Ethernet cards cannot make connections until I reboot the unit. Also, how warm should this device be?
Message was edited by: kionysus

Thanks for the replies,
I have already tried a full power cycle before posting, should have made that clear in my first post, sorry. Straight after the power cut, I shut everything down for 10 minutes, and then powered all device up one by one.
Also, I just tried changing the beginning address from '192.168' to '10.0' and this made no difference to the issue.
When trying to get an IP address through DHCP, I receive;
IP '169.254.117.112'
subnet mask '255.255.0.0'
and empty router field
which is extremely strange, as I used to get a subnet mask of '255.255.255.0' and the router's IP has not changed since getting the TC.

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