@VTDARKSIM did you presoak it (insert without activating it a day ahead of time)? It looks like components of the adhesive used on the G7 interfere and take about a day to disappear (hence the @^#%%^$#@ readings at the beginning of a session).

@cortig
G7 activates when it leaves inserter.
So far I usually heard that the noise is due to the shock to the tissues at just having been stabbed.
@VTDARKSIM