I recently procured my first pineapple MK4, immediately upgraded to 2.8.0, and I have been experiencing the same behavior. I had a Fon router with jasager back when this project first began, and remember it working much better. Currently, I do get people connecting, but not nearly what should be, it is very hit and miss, I'd say maybe 30% successfully associate, and I've been testing in pretty crowded areas for the most part. I'll try downgrading, because I've got unlimited time on my hands this week :)