It is important to keep a consistent level of relative humidity where your piano is kept. This will keep the soundboard from swelling and shrinking which will in turn prevent cracks from forming along with a host of other problems including loose tuning pins.
Since a piano is made of wood the strings will change pitch when it is affected by humidity. Wood swells in high humidity. Be sure to have your piano tuned regularly in order to keep it at pitch.
A new piano or an old piano with new strings must be tuned several times in order to achieve stability. Piano wire is made of steel. Steel stretches and therefore new steel strings will loose tension and go flat until stretched enough to stay at pitch.
Playing an electric keyboard is not the same as an acoustic piano. No matter how closely a keyboard is made to feel like an acoustic piano, they will never have an escapement mechanism, letoff or any other adjustable part that can alter the feel or tone of an acoustic piano.
Every piano player needs to understand regulation and voicing, especially you concert pianists. If you do, you will be able to more closely work with your tuner-technician in order to have more control over your sound and increased expressive ability in your playing.
If the pinblock is separated or cracked, the piano will not hold a tune. In an upright this can possibly be remedied. In a grand the piano will need a new pinblock and new strings.
Broken strings are relatively costly because the tuner-technician needs to come back to the house 2-3 times to adjust the new string. This is because piano wire is made of steel and new strings stretch and lose tension and, as a result, new strings will loosen and go flat.