I had the same problem with my intel 7260 wireless card. It seems to be a well 
known problem, even upstream, but they never applied the 2 lines patch that 
solve it.
You'll found attached the patch that correct the problem on my system.

-- 
Jean-Marie Favreau - http://jmfavreau.info
diff -rupN network-manager-0.9.10.0-orig/src/devices/wifi/nm-device-wifi.c network-manager-0.9.10.0/src/devices/wifi/nm-device-wifi.c
--- network-manager-0.9.10.0-orig/src/devices/wifi/nm-device-wifi.c	2014-09-13 13:22:02.414919913 +0200
+++ network-manager-0.9.10.0/src/devices/wifi/nm-device-wifi.c	2014-09-13 13:23:54.291559350 +0200
@@ -1390,14 +1390,13 @@ scanning_allowed (NMDeviceWifi *self)
 	case NM_DEVICE_STATE_SECONDARIES:
 	case NM_DEVICE_STATE_DEACTIVATING:
 		/* Don't scan when unusable or activating */
+	case NM_DEVICE_STATE_ACTIVATED:
+		/* Don't scan when unusable, activating or already activated */
 		return FALSE;
 	case NM_DEVICE_STATE_DISCONNECTED:
 	case NM_DEVICE_STATE_FAILED:
 		/* Can always scan when disconnected */
 		return TRUE;
-	case NM_DEVICE_STATE_ACTIVATED:
-		/* Need to do further checks when activated */
-		break;
 	}
 
 	/* Don't scan if the supplicant is busy */

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