I know there are one or two other parents out here whose kid has metal issues and use the G4. We couldn't use the MM because of the gold in the filament. Since the G4 is made of silver and platinum, I was hoping it would work for us. However, we are getting a failed sensor every 3 or 4 days. I can usually restart it for another few days. We actually did get 10 days out of the last one, with 4 restarts. I guess my question is, since no one else seems to be having a rash of Failed Sensor errors, any kids with metal allergies having them? I am trying to get to the root of the issue and figure out if this is a good, long term CGM for us.