The keys in modern keyboards are of the rubber/carbon strip type. Each key's contacts should be physically separated from each other by the width of a semitone and unable to move closer unless the strip is somehow deformed. Dust or grease getting into a contact pad will usually either result in an intermittent or silent key, or one that plays with maximum velocity, regardless of how the key is pressed. I can't think of any way that a single key pressed down could trigger two notes, but I haven't looked inside yours!
I can't comment on your particular case but, back before lockdown, I went to see someone who had a similar problem. It turned out that their hand positioning was less than optimal and as they played a key, they would occasionally just catch the black key on one side of it.
So I'd keep the keyboard covered, do the soft reset and double check your hand positioning. If you can, see if you can deliberately make it happen repeatedly, so you can see if there's something obvious happening, or if there's a pattern to it.
If all else fails, it does sound like a key contact problem, albeit one I've not come across before.
And to answer your initial question, no, the keyboard doesn't need any periodic maintenance. Keep it clean and it should be just fine.