Galaxy S3, switching camera function always failed on 2G/3G/4G connection (airdroid 2.0.2)

camera switching function works ok (not all the time) when the target phone on local wifi connection (not the same wifi as viewing point); however, if the target phone is on tmobile data network, the camera switching function just did not work, it keep trying trying ...Does anyone have the same problem? or it is just with Tmobile Galaxy S3. (it is rooted with stock ROM (rooted))

I'm having the same problem with a Galaxy S3 connected via local wifi. I hit the switch button on my PC and the four blue dots parade across the center of the picture forever.