I've a strange issue with 3.3.17~geb8a96c and loosing EPG information.
Usually I'm using EIT only, which is more or less fine for basic information. While trying to enhance EPG with episode information I've sent som e XMLTV using the new unix socket variant.
After sending the data to the socket, information from XMLTV shows fine in the EPG listings, however after a couple of minutes some of the new imported events disappeared together with the information which has been there before coming from EIT.
This was reproduceable - same events vanished.
After disabling EIT and just using XMLTV, it worked.