Going out of tune this quickly?

[derschoenebahnhof]

I bought a new Yamaha C2X in February and it was tuned in March.

All was fine until about a week ago, when I called the tuner for an appointment (Murphy's law?). It started going out of tune quickly... is this expected of a new piano? It is not so much the pitch that is dramatically changing, but if I hold a note the sound is "wobbling" (uh, I don't know how to say this better) a lot more and the tone has gotten so much brighter now in the treble that some notes hurt my ears

Before that, most notes were perfectly fine (a few of them were too bright, but I am sure that can be fixed, or so I read) and I enjoyed playing it. Now I have to wait for a week until the tuner comes. Argh

I am in Northern CA, it is Indian summer these days, hot and dry (about 50'ish % humidity in the house).

Am I supposed to have a new piano tuned even more often?

Thanks,
CG

[j_menz]

New pianos take a while to settle in, and during that time they need to be tuned more often. Six months between first and second tune would be longer than optimal.

Good news is it gets better reasonably quickly and this tune should last six months.

The change in tone/wobble is because the three strings of the upper notes (which is why it is more apparent there) go slightly out of tune with each other (rather than uniformly out of tune). It will be fixed by the tuning, and no permanent harm done.

[quantum]

I find there are certain times of the year when to expect greater then normal tuning instability - usually related to changes in season.  This of course depends on the climate in your part of the world.  If you can, wait until after the piano has settled into the new seasonal climate before having it tuned. 

Your piano is still very new, so give it time to adapt to your home and the seasonal changes that go along with it.  Make notes on how tuning changes according to the climate so you can plan the timing next year's tunings. 

[indianajo]

Humidity changes make wood shrink and expand even more than temperature changes. So if you can de-humidify your house in the foggy season, it might really help.  I'm sure big Sur and Seattle are foggy from the pictures, not that sure about Redlands etc. But cool dry days and foggy days alternating are hard on a piano pin block.