There are quite a few of us. I have been using the G6 system for 2 years. I have had quite a few failures over the 2 years. Some have been false lows, not compression mind you, that caused be to over treat. That has taught me to do a finger stick to check.
My usual problems start around day 7 with a loss of signal, usually accompanied by a sudden drop in BG numbers over 15 minutes to a low or urgent low (not real). Then a 20 to 40 minute wait for data to resume.
If this was user error, why does it begin on day 7 or 8? And I am not alone in this. Someone on Reddit suggested that the sensor lead on the G6 is a different length and angle to the G4 and 5. I have no idea, since I have only used the G6.