Just curious how you know you've lost a signal? The alarm and no reading on the monitor? You do know that when the alarm goes off you've been without that signal for an hour. So if it reconnects within 20 minutes, you've essentially been without any contact with that sensor for an hour and 20 minutes.
FWIW if you lose a signal, and it reconnects before an hour you'll never know that you had lost the signal. A huge shortcoming with the TST system. The notifying time should be only a few minutes, an hour is ridiculous.
Yes, alarm and no signal. But...don't think the signal is lost for an hour prior to the alarm, only because the readings change constantly up to the point of an alarm. Unless of course the readings I'm seeing are historical and being fed to me over time, but that seems unlikely.