I also have seen Apple progress bars rigged to 75%, for some unknown reason, but my biggest offender is my DVR phone app. On connection it shows the last image

I also have seen Apple progress bars rigged to 75%, for some unknown reason, but my biggest offender is my DVR phone app. On connection it shows the last image sent by the camera, and a progress percent. The progress is really a connection timeout, and you can't be sure it connected or not until it reaches 98% and fails.