disable auto find sensor ?

Shouldn’t find anyone else sensor but yours unless you search for a new one. Ones yours installed and paired that’s the only one that’s going to pop up.

it's not like you say. Look for any nearby bluetooth sensor even if it has never been paired. They should prevent this

It's not true. On my last half marathon we were about 800 and my watch didn't search for others sensors

When you're waiting press Start search all Bluetooth sensors nearby. Once started, the activity no longer goes in search. I have the 955 and it behaves like this every day 

So, yours is faulty. I have FR955 too since 1 month and made Crema half marathon on Novembre 13th without problems surrounded by 800 people.

And also during trainings it never search bluetooth sensors or makes popups

Miky said:

So, yours is faulty.

Mine must be faulty as well, because it regularly pops up an alert asking if I want to connect to my Bluetooth HR strap, despite the fact that the device is already connected to the very same strap via ANT+. I don't mind the alert, per se, but I would appreciate that when I select X (No) the watch never ask again for that particular Bluetooth device.

Well, 2 faulty watch. Or faulty users?

Never happened to mine, Polar HR and BT earphone connected

Miky said:

Never happened to mine, Polar HR

How do you have your Polar HR connected? Via ANT+ or via Bluetooth?

Don't know. It's Connected, it works, for me it's enough