Since upgrading to V3, I'm regularly being being presented a series of messages scrolling up in the log window, followed by an error panel advising me that SkyDemon has 'lost contact with the device', or some such words, and to log out and back in again.

We're pretty happy with the allowances we currently have. Two devices being used at once seems reasonable. If the iPhone is for emergency in-flight failures, then being logged in doesn't matter as no live data will be downloaded anyway, so that should be fine.