Hmm I don't think HL is the problem. I connected earlier and it appears there are groups of static aircraft spawning in at certain times (basically loading on top of the same group of planes over and over again) I'm pretty sure you timed out because of the amounts of aircraft. We need to have a way to despawn them every mission or given enough time I think everyone would time out.
I've restarted it and put my mission back up for the time being. I'll talk to spinfx and see what he has to say. I wonder what Monday will bring with regards to MP