Anyone else have a 4/C that has vanished?

I do believe that in the last month or so, my 4/C DS has gone off the radar. Has not called in 2 weeks, no email, and returns about 2 out of 4 texts if they are not important. Most of our texts to him at this point are "How's everything going" or " Give us a shout when you can" type stuff. Oddly, we still seem to get "Hey can you send me..." and "Can you throw a few bucks on the Yard Card?" type texts We are NOT helicopter parents by any means and realize he is transitioning to a man...

Anyone else have a 4/C that has vanished?