SAN typically gets the HI-J config, though one one flight I took, I did end up on a MID-J and yes, the IFE played up exactly as expected. That said, MID-J aircraft tend to seek me out. I got a MID-J on a LAX-LHR flight right before Christmas last year. Both MID-J flights did show up on the seating charts months before I actually flew, so at least I knew to load up the iPads.

if you want to post your flight date (or send me a PM) I can look up EF and let you know what’s currently scheduled.