You may experience intermittent uploads if:

Using a CF to SD Adapter

Please visit this page for more information on CompactFlash Adapters.

Out of range of your wireless network

The wireless range of your Eye-Fi Card for photo and video uploads is listed as 45 feet indoors and 90 feet outdoors. These values are under ideal conditions, camera bodies, walls, building materials and other electronic devices can contribute to reducing your card’s wireless range. When encountering wireless upload failures from within your camera, move your camera closer to your wireless router. Generally if you are within 15-20 feet in line of sight of the router you should be fine. Take several pics and wait for a minute or two to see if the card uploads. If it still fails, remove the card from the camera and insert it into your computer via the supplied card reader. This will allow for maximum range since the card’s antenna will not be constrained by a camera body.

Your camera’s power settings have not been adjusted

If you are having difficulty having the card transfer the files while it’s in your camera, make sure that the power-management settings of your camera are adjusted so that it does not power-down immediately. Most cameras have the ability to adjust the amount of time before the camera cuts power to the card slot. Make sure to extend the amount of time the camera keeps power on to as long as possible via your camera’s “Auto Power Off” setting. This will insure that the card has power when it needs to upload files.