HRM Pro Plus lost connectivity

The HRM PRO PLUS started losing Bluetooth connectivity completely. Garmin Support suggested flipping the 2032 battery upside down as a temporary fix, but I have to repeat this every time I go for a ride, and the connection only lasts a few minutes for 840 to pick it up. I’ve tried a new battery with no success, and despite the device being in excellent condition, the issue persists. Has anyone else encountered this problem or found a reliable solution?