Advice on mirror losing the finish

We updated a bathroom in 2015 and I got what I thought were perfect mirrors with medicine cabinets for the space. purchased new from either Home Depot or Lowes (I have forgotten.) Now, just three years later, the lower edge of both mirrors has begun to darken as the mirror finish comes loose from the back side. Question one, short of kicking out the son who takes 20 minute hot showers without the fan running, how do I keep from getting worse in the short term. Question two, can I remirror it as a DIY or is it better left to pros? (I could just replace the chest and mirror because they were less than $200 at original purchase, but that's a lot of work, too. ) I would put up photos, but I'm getting an error message.

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