For the example i just used the exe file, as the tablet runs windows 8.
For my own clients, one in silverlight for windows phone 8, and one in WPF for regular windows. The code connecting to the server is pretty similar between them.
I had a theory that the problem might be happening if the internet on the pc hosting the server program drops out for a few seconds. It could answer the randomness, and my router does sometimes misbehave. I don’t know a way to actually test this, or somehow try prevent it though, as it seems it just completely bypasses any try catch i implement myself.