As well as this issue I also get a problem where the restart sometime hangs with the Loading database message and the only way I seem to be able to get this to work again is to restart the AppleTV. I am using a mySql database and sharing it with 4 other Kodi boxes around the house, but it is only MrMC that is unable to load the database.
Apart from this the port to the AppleTV is great and I can't wait to retire my old HTPC in the lounge once the main MrMC bugs have been ironed out