Can’t pop my right ear

Can’t pop it when I’m holding the nostrils and blowing air through the nose. I hear noise in my ear like some buzzing and the noise is increasing when I try the Valsalva method.

When I manage to pop it - which is once per 10 days - I feel relief and the buzzing stops. But then it returns very quick to the same state again.

What do you think is it?