I am not 100% certain if it is the lag that is causing the issues or if there is some other factors involved; but here is what happened to me.
While online yesterday [Wednesday 6-9pm CDT] I was experiencing a lot of lag. While in Tristram, I entered Cain's House & Leah's Room in the Inn. I entered both places during the same visit to Tristram - possibly before going to the cemetery. In both places I interacted with the books that appear in those places [their journals]. In both instances when I click on the books they went through the motion of dropping to the floor but never appeared on the floor to be 'pick up' to be read for the lore. The effectively disappeared out of the game.