GaoFit vs wiiwatch 2 for a Lem 12 Pro?

The problem is not the app I think but the bluetooth connection
He makes connection and disconnect after 2-3 seconds and sort on
This is my problem
Do you or anyone else has a solution for that?

I already gave a hard reset to my smartwatch configurate everything again did make new bluetooth connection with my phone still same problem

I did what was standing here also
https://discourse.fullandroidwatch.org/t/lem-12-bluetooth/61971