Cleaning
Many things can fall inside a piano and cause notes to stop working. Grand pianos are more opened up than a vertical piano but verticals can collect dust and dirt inside just as much as a grand. This will cause problems down the road with sluggish action parts. Other foreign objects can make their way inside like paper clips, pencils, coins and damage action parts. If something like a pencil is left on the name board of a piano it could fall inside and cause a bunch of keys to stop working at once. Mice damage is a big concern in some homes and could completely ruin your piano in a very short time.
I would recommend having your piano serviced on a regular schedule to keep your piano in top working order. A full cleaning once in a while with tuning would be a good idea. I have special tools for cleaning the soundboard of a grand that lets me get under the strings and I carry a shop vac with me at all times.
