vinyl siding around windows

We bought a house that has vinyl siding. the siding was done about 4-5 years ago (before we bought the house). Everything still looks fine, except for the vinyl (although they feel more like aluminum) pieces that cover the trim around the windows. Not sure if this is what this area is called (it's essentially the frame around the windows, where you would typically paint the trim color, not the house color). Anyway, I've noticed some of these pieces seem to be coming loose, not near falling off, but enough to where they look off center and need to be snapped back into place. I don't see any evidence of them being nailed in. What's the best way to secure these better? A little adhesive near each corner? Caulk over the seams? Thanks!!
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Depending on how and when the siding was done, those trim pieces could indeed be aluminum. That's what I have on my house. Vinyl siding with aluminum trim around the windows and doors.
The aluminum trim is held in by trim nails which are usually colored to match the trim. The nails may be placed in such a manner as to be inconspicuous, such as very close to the edge and then covered with caulk.
It would be best to determine what you actually have so we can give you the best answer.
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