Bluetooth headset connected but audio lost suddenly

After connecting my Bluetooth headset with the A2DP profile, it works fine most of the time.

But I have noticed a persistent issue when I use youtube/ facebook-

For the first few videos, the audio works fine, suddenly the audio stops working, but the headset is still connected, audio works only after disconnecting and reconnecting.

I am using Ubuntu 20.04.1 LTS with PulseAudio 13.99.1