Bluetooth Connection Problems Android 10

Since the April's security update of Android 10, the Bluetooth connection is not working any more. The connection is always disconnected after a few minutes.

(Build QQ2A.200405.005)

Switching Bluetooth on and off causes the connection to establish again. (But again only for a few minutes)

Opening the Garmin connect app is sometimes enough to establish the connection, sometimes not.

Anyone else has this problem?