I too have noticed that there has been a slowdown in Lovefilm sending out disks, I sent ones back on the Monday, but did not receive new ones till the Friday. Also, I still don't get any of the titles on the top of my list sent out.
I can live with not receiving the disks at the top of my list, my disks are not arriving at all. Disks despatched on 15 June have still not arrived. I recently changed to an unlimited package and my troubles started then. In correspondence Love Film totally deny they have a separate postage system for heavy users: does anyone know differently?