the blocking is IP based, so if one device is spamming the repo your IP is banned for x-minutes
I am VERY interested at a debug log from your Raspberry Pi with LE 9.2, we have several such users that spamming the repo but we have no Idea why this happens. This is likely a Kodi problem, but we have not yet get any useful information.
To upload the log pls enter at the shell or upload the file itself, it would be very helpful