Logs not loading .. at least for several minutes

None of my logs seem to load… or at least not for about 90-120 secs ans then sometimes never. So when I stop or restart an add-on (eg Zigbee2MQTT, Samba or ESPHome and I select the logs to check all has loaded correctly… I get nothing. Just the Refresh button that when pressed doesn’t seem to make any difference.

Any thoughts in what to debug, check or change?