Faint Sewer Scent from Rest room Sink

My spouse notices a faint sewer odor coming from the drain in her toilet sink sometimes. It’s not sturdy however is noticeable, particularly if put face nearer to it. Is there something that must be completed in a different way with the plumbing/p entice (see linked picture beneath) or do I simply have to attempt to snake it? Thanks for any assist!


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