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I got the same issue on my Samsung Galaxy Tab 10.1 (running android 3.2) with the latest preview version installed. It's connected all the time through Wifi, but it almost instantly switches offline. It tries to go online a couple of times, but switches back offline again.
To test interference with other devices, I switched offline on the other mobile (and desktop) devices, but no luck so far.
After some more testing the app went online after removing and installing the app again. Reinstalling wasn't sufficient.