The one set of stories about FP+ disappearing that concerned me greatly were the ones from those that did not[ /B] make a change to their reservations. It seems that for some, the FP+s became unattached to their current reservation and instead floated off to some other "account" that they created by having entered another Disney network contest, etc. This makes me nervous, because in the years prior to FP+, I entered many Disney contests, entered my 2 email addresses in Disney websites in the hopes of getting those elusive pins, etc.
Don't know how frequently it does happen, but so far, my FP+s for my upcoming August trip are fine and they were fine for my January 2014 trip.