Wouldn’t they need to last the full 10 days first? 
Seriously though I have half decent luck getting 9 or 10 days. I imagine this just increases the number of service tickets I open with them.
I’m only 3 sensors in and am so disappointed in the G7. It constantly loses connection even when my phone is directly beside it, the first two didn’t last the full 10 days, and one was constantly reading false lows. I do not trust this new system. I’m going to ask if I can go back to the G6.
I am sorry to hear that. I have had much better experiences with G7 compared with G6, which failed on a regular basis (usually between days 7 and 10), including falling off due to inability to remain attached to my skin, even while using the overpatches.
In the 18 months I have been using G7 I have had only one real issue and that was a bunch of sensors that did not pair and failed one right after the other. I suspected it had something to do with the transfer of mfg to Malaysia. I don’t even use the overpatches anymore as the adhesion is really good now.
I’m with @Karl.n When you get a bad one now you just have to gut out 10 days. And a significant number of mine are deteriorating by the ten day mark. They are going to make you call Customer Service and spend an hour or more just trying to talk to somebody about a replacement. And of course they will increase the price. Groan.
I find the online tickets really efficient. I’d switch to a different brand before calling customer service.