There is always the possibility that some shades may have a poor signal or have difficulty pairing. Though this issue should be rare a few elements that could cause interference, preventing ideal signal, could be: 
- Proximity:  
    the pulse pro will be adequate for approximately 3,000 square foot spaces, but outside that range, the shade may not receive a strong enough signal due to attenuation (gradual decrease in signal strength over a distance) 
 -Multiple Levels: 
     Homes with many floors may also impact the range of the hub due to increased construction materials in between the hub and the shades. 
- Construction Materials:  
     Some dense construction materials may decrease the distance a shade can be from the hub to maintain a good signal. Construction materials such as concrete, cinderblocks, metal doors/walls, and several walls between the hub and the shade. 
- Interfering Devices: 
     If the home has many other Radio Frequency devices or excessive RF repeaters installed this could also cause interference and confuse signals between the hub and the shades.