Last couple of days my iPhone will not connect to the server correctly. (my home computer and iPad are fine). The home assistant device is fully upto date so is server.
The “no space left on device” error seems to be a clue and I’m guessing that it is your iOS device (not HA - but I would check there too). I don’t use iOS so I don’t know how to see space used or clear space on it.
Have you tried rebooting your phone and the HA server?