There are a number of causes for gaps. One is the Plex Media Server automatic periodic refreshes - at the moment that does not pick all updates and new data and so gaps may result. (This is being changed to a full refresh overnight every day - but until then, my advice is to manually do a daily refresh)
With the EPG up to date as far as Plex Media Server refreshes are concerned, any gaps would then be due to other factors - as the one I mentioned, Basically the advice is do manual refreshes daily so that we know the lack of refreshes is not the cause of the observed gaps
