Ok maybe this is an old one, but may worth to share and tell how I worked out that issue, please see my post on the following thread:
Oh, btw, I'm running Kodi 18.
Thanks,
Yanhey.
Posts by Yanhey
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Just went through this same behavior. Although the below is not the solution, but, hopefully, may provide some relief/help to people about this issue.
What happened is after configuring Bluetooth on LibreElec for a stock RPi3 to pair with a device connected to my stereo system... it worked perfect for a little while. I started to use Radio addon to browse radio stations and one of them made Kodi to crash, forcing it to reload (TV screen black and Kodi splash/welcome page to show up, but not rebooting the RPi).
From that point, wanted to check config of LibreElec service addon... but got the message in the title ("Settings addon is not yet ready, please try again later..."). I was not able at all to return back to LibreElec addon config... even after 1 or 2 Kodi reboots... gosh!
Fiddling around (googling, reading threads, etc)... I suspected a bluetooth issue. And here's what I did to "unlock" the LibreElec config addon, from the shell (ssh):
Using bluetoothctl cli tool, removed the device I added/paired with previously. Issued the command remove 00:02:5A:00:23:D7. Which is in fact removed the device by its MAC address. Quit and rebooted Kodi... LibreElec config addon was now back to responsive.
I can't say if this is the exact issue, but kinda "solved" that one of this thread for me.
Thanks,
Yanhey.