How do you fix a bathroom sink that drains slowly when hot water is running?

Sounds wierd, but our late 1800’s home was renovated by the previous owner and now whenever we use the bathroom sink, (especially the hot water) we notice that the sink begins to fill up and drain very slowly.

Upon closer inspection, I can see what looks like air bubbles trapped behind the sink part that has the holes in it to drain. Sometimes the sink drains and other times it drains slowly. When we use cold water, the sink drains normally…as far as I can tell.

We’ve used draino, but again it either drains slowly or drains fast. The pipes are galvanized, but the pipes below the sink are aluminum? I think they’re aluminum or stainless steel.

Is there something I’m missing? Are the air bubbles underneath the sink the cause?

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