UPDATE 09/10/19 – A new enhanced transmitter to resolve the BG loop issue is being issued to Medtronic MiniMed 670G owners. This has worked beautifully for me since receiving it about 3 months ago.
To request for the new enhanced transmitter follow this link.
Or you can contact your Medtronic Diabetes Educator or call Medtronic directly for one.
Couple weeks ago, I could not enter Auto Mode on my 670G for three days due to the dreaded “BG Required Loop.” As a solution, I eventually had to change the sensor to be able to re-enter AutoMode.
God knows I have tried to resolve the issue using every advise given online in forums (including trying to “fake” the system by entering a number just above or below your last entry) but these have only worked only a couple times.
What I think Causes the BG Required Loop
At issue I think is the way that the 670G calibrates the Guardian sensor. It seems to be programmed to validate the BG you’ve entered into the system probably based on the ISIG history and its predictive model of where your BG readings are trending towards.