IP lockout update hanging up

I'm having an issue with Defender on a multisite. This site is about 320 site... and it's been running for a couple months now.
Over the weekend, I noticed on several sites that when checking the IP Lockout sub-menu, the program had a popup that said "updating..."
It ran for hours and hours, getting to 100%, but never dismissing. When I try to open a new browser window and go back there, it just pops up again still at 100%, but never goes away.