Unifi integration - device trackers keep going unavailable

I have HA running on a pi and have the Unifi integration.

My Unifi software runs on a Synology nas and is up and running and accessible with the app but for the second time now I have gone to look at entities in the unifi integration and all of the device trackers show as unavailable?

Last time I “fixed” it by removing the integration and readding it but any ideas what the problem might be?

I know it’s an old thread, but did you get anywhere with this? I’ve just started seeing this as well.

I solved it by restarting the HA core.