I have the lost signal occasionally, but most of the time it is short duration. If it loses for a longer period (not sure how long) it generates an alarm (beeps)....when it reconnects, if you are past one of your pressure related alarms, it will alarm again. You can tell if its' lost link for an extended period by looking at the pressure reading....if the last pressure it had is blinking, it's been a short gap. Once it goes over a minute or so, the pressure reads zero until it reconnects. Now for the really good news....I've had mine do the extended loss twice....following dives it was fine. Upon download, it would only shot the last dive....all previous were not present (although they were still available when looking at the LOG on the computer itself). During this process the computer shut down completely. Both times ended in a return for repair....once under warranty (6 months) the second last month outside of warranty at 2 years.
Recommend you keep an eye out if you lose link for more than a minute.