Watch Disconnect ?

Sometimes when I use my app on watch OS 2 i get this :


image : https://s3.amazonaws.com/f.cl.ly/items/3P3P2R3s1p0N0I2G2P2e/IMG_4553.jpg


And my app freeze :/

How can I do to "reconnect" the watch ?

Watch Disconnect ?
 
 
Q