Get some distilled water (you don’t want tap or spring that could make things worse!) Slightly dampen a cotton swab (Q-Tip) now carefully wipe around the edge of the dial and button areas where you see a gap see if that helps..
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=== Update (08/19/2021) ===
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@tedwynne - Sadly its starting to look like the switch contacts are not working properly. At this point you'll need a new upper case assembly
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[image|2463486]
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It’s a bit of work to replace it. I strongly recommend you let a camera repair person replace the part.
Get some distilled water (you don’t want tap or spring that could make things worse!) Slightly dampen a cotton swab (Q-Tip) now carefully wipe around the edge of the dial and button areas where you see a gap see if that helps..