SWIM 2: Hear Heart Sensor Polar H10 dropping connection after a few seconds

How do I make the connection of my Swim 2 to Polar H10 heart sensor not to drop after a few seconds ? I am trying to do it but the connection drops after a few seconds every time I connect to the sensor and the hear rate stops displaying.

Has anyone experienced this? How dd you solve the issue? It is a new heart sensor.

I tried everything:

1- replacing battery

2- adding more water to sensor strap area

3- desynchronizing wrist heart rate

4- turning on and off Bluetooth