I was attempting to disconnect from the 890L in order to obtain a new ip address so I entered the admin at 192.168.1.1, then went to "Wi-Fi Settings" > "Connected Devices" and selected "Disconnect". I am now unable to connect to the router or the admin area for the router.
I got it working again by going to the "ACL" tab and accepting the MAC address that was listed as "dropt".
Is it possible to obtain a new ip adddress without having to turn the power button off and on on the router?
Sure, disconnect and reconnect from your computer/device. The new attempt to connect will refresh your IP. Chances are that you will be assigned the same IP address as before so it wont be a "new" IP.
Chances are that if your 890L is dropping your devices that its glitching on something temporary. Try to restore the defaults on the 890L to refresh it. There should be a small reset button underneath the back cover by the battery that can do this for you.