libre 2 sensor

The signal from L2 to Phone is Bluetooth - this can be blocked by all the usual stuff - your body, metal, the dog sitting on your phone (usually stops my L2 reading - though not during sleep obvs) etc etc.

Even had the wife lying against my arm and blocking it - the other problems you get are phone / software stack for bluetooth not working terribly well with the Libres - I find some smartwatches have been a problem creating unreliable bluetooth pick up from the Libre, and have had trouble with Samsung phone updates in the past.

I stick with Google pixel phones and the pixel watch seems not to interfere much. Every time I change Libre - reboot my phone and that seems to help.
Your other options are things like MiaoMiao that sit on top of the Libre and send a strong clear bluetooth reading to the phone to be received by the MiaoMiao software - or look at xDrip (excellent app for monitoring BG and works with MiaoMioa or directly to the Libre.

Libre 2 has fairly low power Bluetooth which does not pass through the human body very well. It can help to ensure the phone is on the same side as your sensor.
Incidently libre 3 has stronger Bluetooth power.

I use a Pixel phone. I live in a home with 2ft thick walls. I can be up to 20ft from the phone and don't lose signal. If I go the other side of a thick wall, I lose it, but it reconnects immediately.

I'm impressed with how good and consistent it is.

I don't disbelieve the problems that others report, but unfortunately can't explain them. I can only think the environmental conditions may be different ie other devices, or the phones are different in make, configuration, something else.

Not much help, but I feel the need to post the positive POV as opposed to the bad press that the tech gets.

@barrym Am in agreement, I get the occasional hiccup but most of the time signal is no problem. The accuracy for me is also good.
I have a very up to date phone and no add ons.

I used to keep my phone on a small shelf on the headboard so it was above me. This tended to be more reliable picking up signal either side of my body.
Bluetooth is a science of its own. I'm sure it also helps to have a current phone running latest BT version.
I personally use a higher grade phone. Not sure if there is a difference if using some low end budget smartphone. But I just want to make sure I've got the best chance of a reliable connection.

I use Libre 2 sensors with the FreeStyle LibreLink app on my iPhone. I’ve noticed I don’t get notifications when in my car with my iPhone connected for handsfree - has anyone else experienced this or knows what’s happening?

Sorry no. My alerts do come through.