I have a similar experience.

Interviews are pretty weird in that you meet a new person and then very soon need to have a really serious conversation about important things. It's also a social context which is inherently stressful for the candidate, and where being good at putting them at their ease gives you better results.

I even notice that during the times of my life when I hire a lot, I have a much easier time with being extrovert and social at parties and in everyday interactions.

During times I don't have to meet new people as often, I get worse at it.